The last decade has witnessed a marked increase in the degree of current account imbalances among the industrial countries. At the same time, it is evident that the capital markets of these same countries have become more closely linked to each other. The coincidence of these two observations sets the agenda for this paper, which is the extent of global financial integration and its consequences. In particular, in view of the significance traditionally attached to current account balance as a policy objective and the role that current account balance has acquired in the exercise of international economic policy coordination, the paper discusses the implications of the new circumstances brought about by capital market integration for the importance of the current account position as a policy objective.

The last decade has witnessed a marked increase in the degree of current account imbalances among the industrial countries. At the same time, it is evident that the capital markets of these same countries have become more closely linked to each other. The coincidence of these two observations sets the agenda for this paper, which is the extent of global financial integration and its consequences. In particular, in view of the significance traditionally attached to current account balance as a policy objective and the role that current account balance has acquired in the exercise of international economic policy coordination, the paper discusses the implications of the new circumstances brought about by capital market integration for the importance of the current account position as a policy objective.

The plan for the rest of the paper is as follows. The first section looks at some definitions associated with the balance of payments. The second section discusses the determination of the external current account balance under various conditions and the role of international capital market integration in that process. The paper then examines some evidence on the question of whether capital markets have become more highly integrated; while it acknowledges that the high correlation between national saving and domestic investment seems to indicate a low degree of integration, this discussion suggests some alternative explanations that appear to be more plausible. The following section looks at this same issue from a different perspective, asking whether consumption/saving choices have become less constrained in the recent period, as would be expected if capital markets have become more efficient. The main conclusions are summarized in the final section.


The definition of the balance of payments in this paper, as explained below, is that given by the national income accounts as the difference between savings and investment. This can he shown by noting the following definitions of (i) the current account of the balance of payments, and (ii) the gross national product:


where X is the value of exports, M the value of imports and NPI is net property income from overseas.2 The definition of GDP can be written in the usual way as:


where C is total consumption, I is gross investment, and G is total government spending. Disposable income of the private sector, which is given by the difference between output and taxes (T) is spent on consumption or is saved (S):


Substituting (3) into (1) yields an alternative equation for the current account as the difference between output and total domestic spending:


Substituting (4) into (5) then yields:




In (6, 6a) the current account appears as identically equal to the sum of the net acquisition of financial assets by the private (NFAp) and government (NFAg) sectors (the CAB itself may he defined as the negative of the overseas sector’s net acquisition of financial assets). In (7) the current account is written as the difference between overall national saving—private savings plus government saving (T – G)—and investment.3

Analysis of the Balance of Payments

Table 1 summarizes the trends in current account balances of the major industrial countries. As can be seen from the ratio of the absolute sum of these balances to GNP/GDP, the external imbalances are, in the 1980s, some three to four times the levels reached in the late 1960s and early 1970s. This increase is predominantly due to the large surpluses run by the Federal Republic of Germany and Japan, and the large deficit appearing in the U. S. accounts in the 1980s. (Current account imbalance among the industrial countries outside the seven largest countries has also increased between the 1970s and 1980s, but only by about 20 percent.) The basic evidence would thus appear to suggest that the growing integration of the world’s capital markets may have facilitated the emergence of the U. S. deficit and its counterparts in Germany and Japan. In less accommodating circumstances, some adjustment might have been required at a relatively early stage.

Table 1.

Major Industrial Countries: Current Account Balances, 1965–1990

(In percent of GDP/GNP)

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Source: International Monetary Fund, World Economic Outlook, October 1989.


As already described, the current account of the balance of payments is definitionally equivalent to the difference between a nation’s overall saving rate and its rate of investment: it is also equal to the difference between exports and imports, adjusted for factor income flows and transfers. These two ways of writing the balance of payments identity have given rise to different theoretical approaches to explain the external account that should be regarded as offering complementary rather than competing explanations.

The approach which proceeds from the identity of the current account balance as the difference between exports and imports is the well-known “elasticities” approach; this is based on assumptions about the supply and demand conditions in the markets for exports and imports, with the role of relative prices reflected in the relevant price elasticities. The focus on the elasticities connects the analysis directly to the exchange rate in that changes in the latter, through their impact on the relative prices of domestically produced and foreign goods will lead, ceteris paribus, to adjustments in the supply and demand for imports and exports. (The caveat “ceteris paribus” indicates that a complete account of the effects of an exchange rate change requires a broader analysis of the origin of the exchange rate change.) As noted below, the elasticities approach has an important role to play, for example, in the determination of “fundamental equilibrium exchange rates.”

The complementary “absorption” approach identifies the current account as the difference between national saving and investment (Alexander (1952)). Viewed in this way it is clear that the current account improves or deteriorates as the excess of domestic saving over domestic investment rises or falls. Alternatively, as saving is the difference between income and total domestic spending (including government consumption), the current account improves or deteriorates as “absorption” (consumption plus investment) falls or rises relative to output.

Recent elaborations of balance of payments theory in the context of integrated capital markets (Sachs (1981); Frenkel and Razin (1987)) apply modern intertemporal consumption and saving theory for the behavior of the individual to the economy as a whole. The economy is assumed to be able to freely lend to, or borrow from, other Economics. The paradigm for individual consumer behavior is that of “consumption smoothing.” In the absence of liquidity constraints, consumers smooth their consumption path relative to their lumpy income stream. The life-cycle hypothesis, which builds on the familiar idea that people will borrow during their early working years, then begin to save for retirement during the remainder of their working lifetimes before dissaving in retirement, is an early representative of this approach. It assumes the ability and willingness of agents to look ahead so that current decisions can be said to be forward looking.4

This forward-looking behavior has important implications. Ceteris paribus, a rising income trajectory will lead to contemporaneous current account deficits that eventually would be followed by surpluses. Temporary shocks will have different effects from permanent shifts. A temporary decline in income will be covered by an increase in the deficit (decrease in the surplus) to support consumption, while a permanent decline in income necessitates a complete readjustment of consumption. The opening up of new investment opportunities that have higher returns than existing capital can be shown to lead to an increase in the deficit (decrease in the surplus) on current account that is somewhat larger than the investment itself (the excess reflecting the expected superior returns).

A complication is introduced in the analysis to the extent that government policy may also influence the outcome. Failing full “Ricardian equivalence” when consumers “see through” the government’s financial policies, fiscal policy will affect the current account, which by definition is the residual of total investment and saving, both private and public. Nevertheless, the general thrust of the argument remains unimpaired.

Role of Financial Integration

In a financially integrated area there are no regionally differentiated barriers to the free flow of capital. In consequence, arbitrage will drive the risk-adjusted nominal rate of return into uniformity across the area as a whole. Most political unions are financially integrated areas in this sense. In particular, such areas are normally also currency unions and therefore there is no exchange risk. A movement in the direction of greater integration at the international level thus implies (i) the widespread dismantling of exchange controls and related impediments to the flow of capital between nations, and (ii) the consequent arbitraging of rates of return of assets in different currencies of denomination in different locations.

This process of financial integration began in the mid-1970s with liberalization in Germany, the United States, and Canada among the large countries, and gathered speed at the end of the decade when additional measures of liberalization were undertaken, notably by Japan and the United Kingdom. Since that time, further liberalization has occurred, notably in Europe, where Italy, France, and some other EC member countries achieved the complete elimination of exchange controls by the end of June 1990.5

Since the hallmark of financial integration is the arbitraged uniform risk-adjusted rate of return, its correlate at the level of the global economy is interest parity adjusted for expected exchange rate depreciation. One measurable concept is that of parity between onshore rates of return in different locations after allowing for the cost of cover in the forward market—that is, covered interest parity (CIP).6 What the removal of exchange controls does is to remove barriers to arbitrage between offshore and onshore assets in a currency, and to enable arbitrage—by removing the “country premium”—to bind the onshore rates of return in assets of different currencies located in the corresponding countries of currency issue. The dramatic effect on the onshore/offshore differential of removing exchange controls is illustrated in Figure 1 for the cases of Japan and the United Kingdom, both of which removed controls in 1979.7 The removal of controls implies that these differentials are essentially arbitraged to zero.8

Figure 1.
Figure 1.

Financial Liberalization in Japan and the United Kingdom: the Impact on the Offshore/Onshore Differential

(Annual percentage)

Source: Frenkel (1989), based on Economic Report of the President (1984)1Averages for week ending Wednesday.2Plus (+) favors dollar assets.

A more rigorous test of the extent of integration may be judged by estimates of the deviation from uncovered interest parity (UIP); this deviation is simply i - i* + δ where i, i* are the domestic and foreign risk-adjusted rates of return on assets of comparable maturity, and δ is the expected rate of depreciation. Measuring deviations from UIP requires estimating the expected rate of depreciation. Observed deviations (“violations” of UIP) therefore may be due to errors in estimating expectations or may reflect a risk premium. The large literature on this question9 generally identifies the persistence of a time-varying risk premium, though one related recent study (Frankel and Froot (1989)) using direct expectations data suggested that the variation was all in the expectations error rather than reflecting a risk premium.10

To summarize, the ex ante rate of return approach to the measurement of financial integration identifies major shifts, for short-horizon assets, in the direction of integration in the mid-1970s and early 1980s. In fact, Frankel’s (1989) conclusion from a review of this process is that “the barriers to cross-border flows are sufficiently low that, by 1989, financial markets can be said to be virtually completely integrated among the large industrial countries (and among some smaller countries as well).” However, exchange risk remains a problem, particularly for assets with longer maturities. It is possible that increased volatility in the foreign exchange markets has made exchange rates harder to predict and has thereby limited the degree of financial integration.

To illustrate the implications of capital market integration for the balance of payments, it may be useful to start from the polar extreme of a world of complete capital immobility, or “financial autarky.” In such a world the current account would be required to be in balance continuously up to the limit allowed by the availability of official foreign exchange reserves. Given the appropriate stability conditions, a freely flexible exchange rate could be expected to perform this task with the saving-investment balance cleared domestically by the rate of interest. If the level of output were not fixed, then the task of clearing the external and internal balance could be shared by the level of income. There would be no reason for the rate of interest in different countries to be connected. In such a model there is a binding liquidity constraint on the size of current account deficits and the “sustainability” question is correspondingly easy to answer: no deficit or surplus is sustainable.

Now consider an intermediate regime of relatively, but not completely, immobile capital. It may be appropriate to think of this in stock rather than flow terms; as a country’s stock of international borrowing rises, so does the cost of such borrowing, ultimately very steeply. A liquidity constraint is still binding in that there are limits to borrowing, but the question of sustainability now has some content. To answer this question requires computing whether a country’s present and likely future policies will push its accumulated net foreign debt into the constrained region. Deficits that are matched by investments in profitable projects will be rated differently from deficits which correspond to excess consumption because the former may promise a reversal of the cumulative deficit. It is convenient to characterize this intermediate regime as one in which the liquidity constraint, though less tight, is likely to bind prior to a solvency constraint.

In the case of a fully integrated capital market (in the sense of a market without exchange risk), a borrower—private or public sector agent—needs to meet a solvency constraint, but there is no binding liquidity constraint prior to this. Governments, of course, have more scope to meet their solvency constraints than private sector agents; they have taxing powers, for example. Sustainability now becomes a question of solvency; and there will usually be a variety of policy and current account trajectories which are sustainable in the sense of obeying this constraint, and the concept of sustainability thereby inevitably loses some of its apparent precision. This taxonomy illustrates how the significance of the concept of sustainability is diminished as the relevance of liquidity constraints decreases and ultimately converges toward that of solvency.

Under the Bretton Woods regime, in which capital mobility was restricted, the fixed but adjustable exchange rate and demand management policy had to be set in such a way as to clear the current account up to the limit given by any long-term net capital inflow. Thus the connection between the current account and the exchange rate was relatively direct. In the liberalized system prevailing today, this link has essentially disappeared.

Following Williamson (1985), a country’s fundamental equilibrium exchange rate (FEER) may be defined as the real effective exchange rate that is compatible with the current account balance existing under the “normal” (i.e., cyclically adjusted) functioning of an economy. To be more concrete, an economy operating at normal capacity levels in the medium run will generate, conditional on the policy setting, rates of saving and investment which imply a particular current account balance. The equations determining the current account can then be inverted, for given levels of domestic and world activity, and a given level of debt service (property income) so as lo yield (via the trade elasticities) the corresponding real exchange rate, the FEER. Calculations of FEERs are intended as a policy guide rather than as a positive estimate of the medium-run exchange rate. However, if the fiscal policy assumption is “realistic,” these two ways of regarding the FEER would essentially be identical. In principle, a FEER calculation will yield a trajectory rather than a single figure, if only because of debt-service dynamics.

Three difficulties arise with FEER calculations. First, in the absence of full “Ricardian equivalence,” the assumption about fiscal policy is critical, and necessarily normative. Second, the debt-service assumption may generate a kind of hysteresis effect. If the course of the actual exchange rate is different from that of the FEER, then the dynamics of debt accumulation and debt-service obligations will deviate from those involved in the FEER trajectory, which may require that it be continually recalculated. Third, in circumstances of fully integrated capital markets, the calculation of FEERs is largely arbitrary because governments and countries have liberty to borrow or lend (net) subject only to a solvency constraint. This constraint can generally be met by a variety of policy and associated current account trajectories, with correspondingly different FEERs.

Policy Toward the Current Account

The discussion above raises the issue of the extent to which a country should conduct its macroeconomic policy on the basis of targets for its current account. Traditionally, there is little doubt that for most countries the balance of payments on current account has been a principal objective of (or constraint upon) economic policy. It is easy to see why this would be the case in a regime of limited capital mobility such as the Bretton Woods regime. Under the arrangements underlying the international monetary system in that period, an incipient current account deficit required an exchange rate devaluation or deflation. In the Bretton Woods system, however, a policy of devaluation became associated with negative connotations, and in practice an exchange rate adjustment was used only sparingly. Accordingly, current account balance, or an imbalance up to the limits given by the inflow or outflow of long-term capital (as in the notion of the “basic balance”), often became a target for policymakers such that an actual or prospective deficit (surplus) prompted deflation (reflation). Therefore under conditions of a low degree of capital mobility, the current account is likely to continue to be a target of policy even if the exchange rate arrangement has been transformed from a fixed-but-adjustable regime to a flexible system. While there has been a reduction in the political sensitivity that attaches to exchange rate adjustments, in many cases governments are still quite sensitive to the economic and other consequences of exchange rate changes and so will continue to treat their current account position as a legitimate target for, or constraint upon, economic policy.

The rationale for current account targets when capital markets are highly integrated is less compelling. When there are no barriers to financial flows and capital is highly mobile, the current account simply reflects the net effect of decisions taken by agents within a framework of constrained optimization. The value of the current account is of little importance, being simply a residual outcome of private actions. Cooper (1981) makes the point in this way: “In the context of overall saving-investment analysis countries should not take any particular view of their current account positions at all. Some will draw savings from the rest of the world, others will invest in the rest of the world. Nothing is wrong with this, it is as it should be.”11 While the degree of capital mobility and the adoption of the current account as a target or constraint governing generalized fiscal and monetary policies are conceptually separate items, the former would indeed appear to have implications for the latter.

Even in a world of highly integrated capital markets, however, there may be reasons for the government to target the current account. One set of arguments focuses on the inverse of the current account, the capital account, and identifies the possibility of a departure of social from private benefit in decisions about net foreign investment. Private decisions to invest at home or overseas will be taken on the basis of expected after-tax returns; from the point of view of the social benefit of the potential capital exporting country, however, the relevant comparison is between the foreign after-tax rate of return and the domestic pre-tax rate of return since the domestic tax proceeds are retained. This suggests that a measure of restraint over capital outflow might be an appropriate response. In a similar vein, where the private investor will compare expected rates of return adjusted for the probability of losses owing to fraud or confiscation, the government of the potential capital exporter could argue that this does not fully take account of the social interest. If confiscation or fraud occurs at home, the losses of one domestic private investor become the gains of another, whereas if the loss occurs overseas, it is an overseas resident (or government) who benefits. These considerations also could justify limiting capital outflow. By contrast, concern about The influence of foreign capital on the domestic economy may motivate restrictions on capital inflows. Explicit restrictions reduce the mobility of capital and will tend to elevate the current account as a policy goal; even in the absence of such restrictions—and their progressive dismantling is a feature of post-war history—it can be argued (e.g., Summers (1988)) that the state of the current account—which is after all just the inverse of the capital account—will not be a matter of indifference to governments.

There are also policy considerations which, though not aimed at the current account per se, nevertheless imply predictable outcomes for a country’s external accounts such that even though it is not itself an explicit target, it will nonetheless be limited in some way. For example, current account deficits may be a symptom of excess demand and inflationary pressure; this is the interpretation customarily associated with the “absorption approach.” To the extent this is true, it would not be surprising to find that the conduct of counterinflationary policy would look rather like a policy of targeting the current account. But it is by no means the case that the reduction of inflation and the reduction of current account deficits are synonymous; for example, a combination of lax fiscal and tight monetary policy, which promises the reduction of inflation through the appreciation of the exchange rate, has the opposite implication for the current account. Indeed, it is interesting to note that the targeting of national wealth has been advocated recently by writers in the Keynesian tradition (Weale and others (1989)) precisely on the grounds that it is necessary to correct for a bias Toward a tight money/lax fiscal policy combination to achieve full employment with low inflation. For given values of capital investment, such a target would again imply, residually, a current account target. In contrast to this approach, policies designed to secure an “over”-devaluation of a currency with a view to promoting the growth of tradables production may result in a current account surplus and thus look like a latter-day mercantilism, thereby elevating a trade surplus to a policy goal.12

Saving-Investment Correlations

The ex ante rate of return approach to the measurement of financial integration described above may be contrasted with the ex post approach of examining whether flows of saving and investment have exhibited behavior indicative of integration. Such an alternative test, based upon the behavior of saving and investment between countries, was proposed by Feldstein and Horioka (1980). They argued that in a world characterized by high capital mobility there is no a priori reason to expect saving and investment to be correlated across countries. Savers in different countries face the same interest rate; hence the relative level of saving in one country compared with another is determined by structural factors in the different Economics. Similarly, investors also face the same interest rate, so investment decisions simply depend upon relative investment opportunities. Assuming that structural factors affecting saving and investment are not correlated, domestic saving and investment rates will also be uncorrected. If, on the other hand, capital mobility is restricted then domestic investors will face a wedge between the cost of domestic and foreign saving, and hence domestic saving and investment will be correlated. Indeed, in the extreme case of zero capital mobility, saving and investment would be perfectly correlated.

In order to test this hypothesis, Feldstein and Horioka ran the following cross-section regression:


where I represents domestic investment, S national saving, Y output, subscript i represents different countries, and ε is an error term. They interpreted the coefficient β as measuring the amount of domestic saving required to finance an extra dollar of investment. These regressions revealed that saving and investment rates were highly correlated, in terms both of levels and medium-term changes over time. The estimated coefficients were generally significantly different from zero, but not from one, using both ordinary least squares and instrumental variable techniques, and showed no signs of declining over time. Subsequent work has confirmed that these coefficients are large and significantly different from zero, although recent data indicate that the coefficients may have fallen somewhat in the 1980s.13

The results from regressions using equation (8) on data for 23 industrial countries over various time periods are presented in Table 2. The regressions show large and significant coefficients; for the full 1960–86 period the estimated coefficient using gross saving and investment is 0.79.14 There is also some evidence that the coefficient has been falling over time. The coefficient estimate for the period 1960–73 is 0.91, and insignificantly different from unity; for the 1974–86 period the estimated coefficient falls to 0.67, and for the period 1980–86 it falls further to 0.61.15 When net saving and investment data are used, however, the coefficient shows almost no decline over time.

Table 2.

Results from Regressions of National Saving on Investment

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Source: Feldstein and Bacchetta (1989).Note: The table reports estimates of the coefficient β in equation (8). Standard errors are indicated in parentheses.

In addition to these cross-section results, various authors have found a close correlation between saving and investment over time. Bayoumi (1990), for example, estimated the following equation using annual time series data for ten industrial countries.


This equation is found to yield a positive correlation between saving and investment in all cases except Norway. Moreover, the estimated coefficient is insignificantly different from unity and significantly different from zero for seven of the ten countries.16

Three broad sets of explanations for these high correlations have been identified in the literature:

Low international capital mobility. Despite other evidence, international capital mobility may in fact be low, owing to factors such as information constraints, lack of enforceability of contracts, exchange rate risk and, in earlier periods, exchange controls. This is the original interpretation proposed by Feldstein and Horioka and later reaffirmed by Feldstein and Bacchetta (1989).

Private sector behavior. Several authors have built models in which there is perfect capital mobility, but saving and investment are correlated because of factors such as productivity shocks, population growth, or low integration of international goods markets. In this interpretation saving and investment are correlated because they both react to a common set of conditions (Tesar (1988)).

Government targeting of the current account. Governments may use fiscal and monetary policies to target the current account (Summers (1988)).

These explanations have substantially different policy implications. Low international capital mobility implies that policies to promote domestic saving should also raise domestic investment. In contrast, if the correlations reflect private sector behavior in a world of high capital mobility, policy-induced increases in domestic saving will tend to flow abroad unless accommodated by measures to promote investment. Finally, the possibility that governments have been targeting the current account raises the question of the appropriateness of such a policy, as discussed above.

In order to differentiate among these hypotheses, it is necessary to go beyond the simple regressions outlined in Table 2. One avenue of investigation involves calculating the behavior implied by theoretical models. Obstfeld (1986) found that the correlations implied by a simple model of saving-investment behavior were of the same order of magnitude as the observed ones; Frankel (1989) and Tesar (1988) report similar results for somewhat different theoretical models. Although these results show that the correlations can be explained by private sector behavior, they do not demonstrate that they are caused by such behavior.17 Furthermore, these models are usually directed at the time series behavior of saving and investment, and hence are less useful for explaining the cross-section correlations.

A second line of inquiry has involved disaggregating total saving and investment. Feldstein and Horioka examine data for several sectors and conclude that there is little evidence of different sectoral behavior. Summers (1988) regresses the private sector saving investment balance on the government deficit, and finds a strong negative correlation, a result which he attributes to government targeting of the current account. Roubini (1988) proposes a model where government policies to smooth taxation produce time series correlations between total saving and investment, and presents regressions supporting this model. However, in both these cases the results also appear compatible with the hypothesis of low international capital mobility.18 Bayoumi (1990) looks at the correlation between private sector saving and investment, and finds lower correlations for private sector data than for total data. He argues that this is evidence against explanations based on private sector behavior. He also finds that the time series correlations between saving and investment are reduced when fixed investment is substituted for total investment.

Studies have also been made of saving and investment correlations for alternative data sets. Murphy (1984) reports the results of running saving-investment regressions using data for the top 150 U. S. corporations. He finds high correlations and argues this shows evidence that the observed correlations are caused by private sector behavior. Another approach has been to consider data derived from regimes which are known to exemplify a high degree of capital market integration. In this spirit, Bayoumi (1990) runs saving-investment regressions on international data from the classical gold standard period (1880–1913), while Bayoumi and Rose (1989) use post-war data on regional saving and investment For the British Isles; in neither case do the correlations reveal any significant relationship between saving and investment.19 These results argue against the private sector behavior hypothesis, since one would not expect different behavior across regimes. At the same time, however, they do not help distinguish between the government policy and low mobility hypotheses. Unlike the currency union of the United Kingdom and the stable exchange rate of the gold standard period, today’s capital markets have to cope with exchange risk; and whereas it can be assumed that government intervention in the gold standard period or between the regions of the United Kingdom was minimal or zero, no such confidence can be expressed about the absence of current account targeting in the postwar period. A direct approach to this last question is possible, however.

A third approach is to estimate government reaction functions to establish whether the current account has been a major policy objective and, if so, whether there is any evidence of change in this regard. Generally, policy reaction functions are estimated as reduced-form equations with the government policy variable as the dependent variable, and lagged values of policy targets as the independent variables. Black (1983), in a wide-ranging study of monetary policy in the major industrial countries, concludes that external variables (which in his case do not include the current account) are relatively unimportant for the United States, but generally have greater weight for other major countries. Joyce (1986), in a summary of the reaction function literature, comes to similar conclusions about monetary policy; she also surveys the rather smaller literature on fiscal reaction functions and concludes that the evidence of systematic fiscal policy “is weaker” than for monetary policy.

The appendix reports some new work on government reaction functions. Reasonably stable monetary policy reaction functions are identified for several countries; these functions suggest that the current account was a policy target in the 1970s, and that its importance declined in the 1980s. Interestingly, these results appear as strong for the United States as for other countries. While attempts to estimate stable fiscal policy reaction functions based on lagged variables were not successful, this work did identify a strong negative contemporaneous correlation between the saving-investment balances of the government and private sectors. These results indicate that the two balances almost completely offset each other in the 1970s, although the correlations have fallen somewhat in the 1980s. If this reflects a policy response, it must be admitted that the degree of policy success is rather surprising; the correlation is of course not incompatible with the alternative hypothesis of low capital mobility.

Consumption Paths and Financial Integration

The fundamental advantage of closer financial integration between countries is that it allows countries to choose paths for consumption and investment which are independent from each other (subject to a long-run budget constraint). In a situation of financial autarky, consumption and investment are constrained to add up to the output of the economy, and therefore cannot be considered to be independently determined. On the other hand, if international financial markets are open, then the sum of consumption and investment can diverge from national product as foreign saving can be used to bridge the gap between domestic saving and investment. This section looks at evidence relating to whether national consumption paths have become more “optimal” over time, as international financial markets have become increasingly integrated.

Modern work on consumption usually starts from the Euler equations implied by maximizing behavior. These models assume that the consumer can borrow and lend freely at a given real interest rate; together with more technical assumptions, this implies that the intertemporal path of consumption can be characterized by the following relationship:


where ct is the level of consumption in period t, U(.) is the utility function of the consumer, β is the consumer’s discount factor, rt is the real interest rate faced by the consumer and Et is the expectations operator conditional on information known at time t.

This equation states that the marginal utility of consumption today is equal to the expected marginal utility tomorrow, adjusted by the real interest rate and discount factor. Combined with the assumption of rational expectations, this model predicts that the current change in consumption should not depend upon any lagged information, except the first lag of the real interest rate. The intuition behind this result is that consumption simply depends upon permanent income and the real interest rate. In any given period, the estimate of permanent income includes all information up to that point, hence no other information should be pertinent to the decision. This characteristic can be used to test whether consumption paths deviate significantly from the “optimal” path implied by equation (10).20

The international implications of equation (10) have been explored by Obstfeld (1986). He noted that, in a world of perfect capital mobility, consumers have access to both home and foreign capital markets. As a result, while home consumers have access to a real return of (1 + it)(Pt/Pt+1), the foreign consumer has access to a real return of (1 + it,)(P*tXt/P*t+1Xt+1), where asterisks represent foreign variables and Xt is the current exchange rate measured in home currency. Using a particular functional form for the utility functions, and equating the terms in interest rates for home and foreign consumers, produces the following equation:


A similar expression can be derived using the foreign interest rate.

Obstfeld estimated equation (11) using data for the United States, Japan and the Federal Republic of Germany. He rejected the model for the period up to the break-up of the Bretton Woods system, but not for the period afterwards. While these results are suggestive of an improvement in the path of consumption, considerable caution should be exercised. The reason for this is the inclusion of a term in the change in the exchange rate in equation (11). The floating rate period has been characterized by considerable volatility in exchange rates. This adds noise to the realizations of the term within the expectations operator, making it more difficult to reject the hypothesis.

This framework was also used by Bayoumi and Koujianou (1989), using data for six countries from the floating exchange rate period, to examine two hypotheses: whether the model holds for the entire period, and whether it holds better for the more deregulated 1980s than for the 1970s. Their results indicate that for the entire time period the model can be rejected. There is, however, some evidence that the path of consumption has become “more optimal” as a result of international financial market deregulation in the 1980s.


While the interpretation of the evidence presented above is not entirely unambiguous, certain facts seem fairly clear. First, considerable liberalization has continued from earlier decades through the 1980s, which has resulted in a closer integration of world capital markets.

At least for low-risk, short-horizon instruments, capital is now very highly mobile. Second, there has been a marked increase in current account imbalances in the 1980s compared with earlier decades. Third, however, the evidence shows that overall net flows of saving and investment are still markedly insular compared with the paradigms implied by fully integrated capital markets and the evidence from the gold standard period. The research reported in this paper suggests that the principal explanation For this is probably that macroeconomic policies have in part been concerned with the current account position and have aimed at offsetting to a large extent the fluctuations in private sector saving-investment balances, thereby reducing countries’ net involvement in the world capital market. Another part of the explanation no doubt has to do with exchange risk. Exchange risk raises the cost of forward cover and may exert a strong deterrent force for those maturities for which forward facilities are nonexistent.

If it is accepted as a basic finding that there has been a genuine increase in the integration of the world’s capital markets—a movement more likely to be continued than reversed—an issue to be addressed concerns the implications of this trend for economic policy. Current account imbalances have long been a leading target of economic policy and are one of the indicators closely monitored by the Fund in the context of its surveillance activities, both in consultation with member countries and in the World Economic Outlook. A movement toward more integrated capital markets implies that the current account is more of a residual factor that reflects the net effect of agents’ decisions, and inevitably weakens its role as a policy objective; indeed, it is possible to view events in the 1980s as already confirming this.

Finally, the interpretation of a given balance of payments position from a policy perspective depends not so much on the magnitude of the imbalance, but on an assessment of factors underlying the investment (both private and public) and saving decisions that give rise to the imbalance. To the extent that inappropriate fiscal policies are reflected in recourse to foreign savings, policy action should aim at addressing the government’s budgetary position. If private saving and investment decisions are subject to microeconomic distortions, then the proper policy response would be to remove these distortions. If a current account deficit is a source of concern because it generates pressure to adapt trade restriction to close the payments gap. then the preferred course of action for policy makers is to resist this pressure rather than allow macroeconomic policies to be influenced by protectionist sentiment. Thus the “first-best” approach is to correct those policies that may be generating the external imbalance, rather than to interpret the imbalance itself as necessarily a cause for concern.

Appendix Policy Reaction Functions

This appendix reports the results obtained from policy reaction functions estimated across a number of different countries. The main focus of this work is to examine the degree to which government policy has reacted to the current account, in order to investigate the hypothesis of Summers (1988), among others, that the observed crosscountry correlations between saving and investment are due to government policy. As the observed correlation between domestic savings and investment has declined between the 1970s and the 1980s, this work also investigates whether there has been a fall in the importance of the current account as a policy target over the last twenty years. Monetary and fiscal policy reaction functions are estimated directly, using reduced form equations with a policy instrument as the dependent variable and (lagged) targets as the independent variables. While there are other, more structural, methods of estimating reactions functions (Pissarides, 1972), the reduced form approach has been widely used in the literature (Joyce, 1986).

Monetary Policy Reaction Functions

The monetary policy reaction functions are based on estimated equations of the following form:


where i is an interest rate, y is the logarithm of real output, p is the logarithm of the price level, (CA/Y) is the ratio of the current account surplus to output and Δ is the first difference operator. This equation states that the authorities raise or lower interest rates depending upon the recent behavior of three target variables, namely growth of output, inflation, and the size of the current account. The expected signs of the coefficients of these target variables are given below the coefficients. Growth and inflation represent the basic internal targets of monetary policy, while the current account variable represents the external target.

Before estimating an equation such as (A1) above, several issues require discussion. The first is the possible endogeneity of the policy variable; if the chosen interest rate is not fully under the control of the authorities, the estimated coefficients may in fact represent endogenous behavior rather than policy decisions. To avoid this problem the interest rates chosen were official discount rates, as these are fully under the control of the authorities, and are generally adjusted in discrete steps.

A second issue involves the treatment of expectations. It seems reasonable to assume that the authorities adjust policy instruments to expected future changes in the economy, not those which have occurred; hence, ideally, rather than using lagged values of the targets, it would be preferable to use expected future values. However, it is not the actual outcome of the target which should be used, but the outcome in the absence of any policy intervention. As changes in the policy variable affects the future outcome of the targets, it would be necessary to specify a model of the effects of policy instruments on the economy before the correct expected values of the targets could be derived, and any results for the reaction function would involve a joint test of the rest of the model. To avoid these problems, lagged targets were used in the regressions. This procedure is justified if future expected outcomes are based upon past behavior.21

Finally, there is an econometric issue which should be considered. As was noted above, the dependent variable in these regressions moves in discrete steps, while standard regression analysis assumes that the dependent variable is continuous. If it is assumed that there exists an underlying continuous reaction function, but that the actual outcomes are then rounded to the nearest (say) half a percentage point, the rounding introduces a new source of error into the regression. As a result, while the estimated coefficients are still unbiased, estimated standard errors will be upward biased. The reported results have been adjusted to take this into account.

Table 3 reports these regressions for the United States, Japan, the Federal Republic of Germany, and Italy.22 The results are reasonably encouraging; in every case the sum of the coefficients on the targets has the correct sign. The coefficient associated with growth is significant at conventional levels in three of the equations, although somewhat surprisingly inflation is only significant for the United States. Using a one-tailed test the coefficient on the current account is significantly different from zero for both Japan and Germany, is totally insignificant for the United States, and has a t-value of 0.9 in the ease of Italy. These results confirm the conventional view that external factors have been a relatively unimportant influence on U. S. monetary policy, but have played a larger role in other countries.

Table 3.

Regression of Change in Interest Rate on Lagged Targets1

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The data period is 1971:3–1988:2. Adjusted standard errors are indicated in parentheses.

If government policy is a major cause of the observed correlations between saving and investment, the reduction in the magnitude of these correlations between the 1970s and the 1980s should show up in terms of a decline in the importance of the current account as a policy target. Table 4 reports the results of regressions designed to investigate this hypothesis. In addition to the targets, these regressions include dummy variables that represent the values of the targets in the 1980s. The coefficients on the target variables represent the importance of these targets in the 1970s, while the coefficients on the associated dummy variable show the change in the value of the targets between the 1970s and the 1980s. (The coefficient on the targets for the 1980s can be calculated from the sum of the coefficient on the target and its associated dummy variable). In order to simplify the presentation only current values of the targets are included in the regressions; results using lagged values are broadly similar.

Table 4.

Differences in Target Coefficients Between 1970s and 1980s1

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The estimation period is 1971:3–1988:2. Adjusted standard errors are indicated in parentheses. DUM equals 0 in 1970s and 1 in 1980s.

These results are also encouraging. The most striking results pertain to the current account variable; all the coefficients relating to the current account in the 1970s have the expected sign and have t-ratios well above unity. Furthermore, all the regressions show a fall in the size of the current account coefficient between the 1970s and the 1980s.23 This decline reduces the coefficient to near zero for the United States and Germany, halves the coefficient for Italy while leaving it relatively unchanged in the case of Japan. Turning to the domestic targets, in the 1970s inflation has a larger and more significant coefficient than growth in all the regressions, and is significant at conventional levels in three of the four countries.24 The results for the 1980s show less uniformity, with growth becoming more important than inflation in the United States and Japan, but not in the Federal Republic of Germany or Italy.

Overall, these results appear to provide some support for the view that the current account was a significant policy target for monetary policy in the 1970s, but that its importance diminished somewhat in the 1980s. This behavior appears to correspond to a reduction in the correlation between saving and investment among OECD countries. Since the major effect of monetary policy is probably on private sector saving and investment, rather than on the government balance, these data do not provide support for the hypothesis of Summers (1988) that it is fiscal policy which has been used to target the current account, but rather that governments have sought to influence private sector behavior in response to current account imbalances.

One last issue which should be addressed is whether the estimated reaction functions are stable over time. The data in Table 2 indicate that there are significant changes in the estimated coefficients between the 1970s and the 1980s; the question is whether this instability is important for shorter time periods. One way of testing this proposition is to estimate rolling regressions. These involve choosing a fixed time period, in this case 24 quarters,25 and regressing a given equation over this time interval starting in successive time periods; hence the first regression runs from 1972:1 to 1977:4, the next from 1972:2 to 1978:1, and so forth. The estimated coefficients, plus their standard errors, can be plotted in order to give a visual impression of the stability of the regression coefficients. This exercise has been carried out using a regression with only current target variables. The results (not reported here) are somewhat mixed. For the United States and Germany the data indicate fairly gradual movements in the coefficients, the Italian data show severe instability while the Japanese data show some instability at the beginning and end of the period. Overall, these results do not appear to invalidate the results for the longer periods, in that the estimated policy reaction functions are not excessively unstable.

Fiscal Policy Reaction Functions

In theory, fiscal policy reaction functions can be estimated in exactly the same manner as monetary functions. However, in practice several factors make estimation more difficult. The first, and most important, has to do with the exogeneity of policy. Fiscal systems are extremely complex, and the policy instruments which are under the direct control of the government, such as tax rates or allowance provisions, are numerous. Summary measures of policy, such as the deficit or average tax rate, are not entirely under the control of the government given that they are likely to be affected by growth and other factors.26 The empirical work in this section uses the budget deficit as the basic definition of policy, but allows for some endogenous effects. (This work could be extended to other summary statistics, such as average tax rates.)

A second issue concerns the time scale over which fiscal policy is planned. While some adjustments often take place during the year, most fiscal policy changes are announced in the budget. Hence, while monetary policy can be analyzed on a quarterly or monthly basis, fiscal policy is probably best approached using annual data. This reduces the number of data points available, and lowers the precision of the estimates.

Two reaction functions were estimated for 12 industrial countries. The first regressed the ratio of the budget deficit27 to GDP (the policy variable) against its own lagged value and lagged values of the three targets, growth, inflation and the current account; in the second, contemporaneous values for growth and inflation were included as proxies for possible endogeneity effects. The expected signs for the targets are the same as in the monetary regressions; growth and inflation should he associated with rises in the government surplus (reductions in the deficit) in order to stabilize demand, while changes in the current account should be negatively correlated with the government surplus if the current account is a target.

Table 5 shows the results from estimating the first equation; those from the second equation were broadly similar and are not reported. The coefficients are generally positive, but not significant. More worrying is the fact that all the coefficients on inflation fail to produce the expected sign; it appears that governments reacted to inflation by allowing their budget positions to deteriorate. This may be a result of the fact that inflation raises interest payments on government debt. The current account coefficients have no consistent sign, and are generally insignificant. The last column of the table shows the results when the six major industrial country equations were estimated as a system, with all the coefficients except the constant constrained to be equal across countries. The system results, which can be seen as a summary of the individual country regressions, indicate that growth has a positive effect on the government surplus, inflation has an insignificant coefficient, while the current account has a significantly positive effect, the opposite to the sign that would be expected if governments target the current account.28 Attempts to find differences in the importance of the current account between the 1970s and the 1980s also produced unsatisfactory results. Overall, this evidence suggests that fiscal policy, as measured by the general government deficit, was not influenced by developments in the current account.

Table 5.

Regressions of General Government Deficit on Lagged Target Variables1


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The estimation period is 1972–86. Standard errors are indicated in parentheses.

Uses data on first six countries.

Contemporaneous Saving-Investment Correlation

The above results from estimating policy reaction functions are mixed. Monetary policy appears to have reacted to the current account, but there is little evidence that fiscal policy did. This section explores the existence of a contemporaneous correlation between the government and private saving investment balances.

The following regressions were estimated using a first-order autocorrelation adjustment:

Private[(SI)/Y] = α+βGovernment[(SI)/Y],(A2)

where Private means private sector. Government is general government, and S, I, and Y represent nominal saving, investment, and GDP respectively. The coefficient β can be regarded as the degree to which changes in the government balance offset changes in private sector balance; a coefficient of –1 indicates that changes are fully offset. It should be emphasized, however, that the direction of causation is not clear.

The results from these regressions are presented in Table 6. In 8 of the 12 regressions the estimate of β is insignificantly different from –1, with estimated values ranging from –0.8 to –1.1. Of the other four regressions, two have sizable negative estimates of β, while the two regressions with positive estimates of β, for the United Kingdom and Norway, also have the highest standard errors.29

Table 6.

Regressions of Private Sector and Government Saving-Investment Balances1


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The estimation period is 1972–86. Standard errors are indicated in parentheses.

To test how robust these findings are two further sets of regressions were estimated. Contemporaneous values of growth and inflation were included to test whether the correlations were caused by automatic stabilizers; the results were similar to the initial regressions. Finally, the possibility that these correlations reflect the treatment of all nominal interest payments as income in the national accounts was also examined. In times of inflation this artificially boosts the income, and hence saving, of net creditors, such as the private sector, while lowering the income and saving of net debtors, such as the government. A crude adjustment for this can be made by increasing government saving by the product of net out-standing government debt and inflation and reducing saving by the private sector by an equal amount. These calculations were made for the six major industrial countries in the sample, starting in 1977; the resulting regressions were similar to those without the inflation adjustment.

There is also evidence that the importance of these correlations has fallen over time. Table 7 reports the results when a dummy variable representing the change in the coefficient β in the 1980s is included in the regressions. The results support the thesis that the coefficient has fallen between the 1970s and the 1980s. Although rarely significant at conventional levels, the results show a fall in the implied correlation over the 1980s in 8 of the 12 equations.30 This fall in the observed correlations parallels the observed decline in the correlation of national saving and investment rates.

Table 7.

Differences in Saving Investment Correlations Between the 1970s and 1980s1


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The estimation period is 1972–1986. Standard errors are indicated in parentheses. DUM is a variable equal to 0 for the 1970s and 1 for the 1980s.

Overall, there is significant evidence of a negative correlation between the saving and investment balances of the private and government sectors. The cause of this correlation suggests two explanations, which are not necessarily exclusive. The first is that international capital mobility is low, although it has risen somewhat over time; hence any imbalance between saving and investment in one area of the economy requires an offsetting imbalance in another sector due to crowding out. An alternative explanation is that the government targets the current account. Fiscal policy adjustments could be made during the year, producing the contemporaneous correlation, or monetary policy could be directed to the current account, causing movements in both the private and government balances.


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Michael Artis is a Professor at the University of Manchester and Tamim Bayoumi is an economist at the International Monetary fund. The paper was written while Professor Artis was working as a consultant to the IMF’s Research Department. The authors would like to thank Jeff Frankel, Lars Svensson, Jim Boughton, Graham Hacche, and participants at an IMF seminar for useful suggestions and comments. They would also like to thank Flemming Larsen for suggesting the topic.


For the convenience of exposition transfers are omitted.


These definitions follow convention in assuming that all of G is a “consumption good.” In effect, of course, governments typically undertake a large amount of investment which should he recognized in empirical analysis of this topic (see the work reported below).


As saving is simply the addition to wealth, another way to think about the saving process is as an adjustment toward a desired wealth/income position (which itself may be an evolving target). This in turn indicates that current account surpluses (and deficits) are not unbounded; verification of the nature of these processes over long periods is an important objective for future research though one that is somewhat hampered by lack of data.


Frankel (1989) provides a comprehensive review of the process of liberalization and computes various associated measures of financial integration.


Offshore CIP (i.e., covered parity of returns in Euromarkets) does not imply that arbitrage can operate freely across national boundaries: since the same institutions set both the forward rate for a currency and the Euro-interest rate in that currency by reference to CIP (Johnston 1979), observed deviations from offshore CIP are invariably due to no more than the employment of imprecise (perhaps averaged or inexactly date-matched) data.


We are grateful to Jeff Frankel for permission to reproduce this diagram.


Frankel (1989), Table 6 shows that prior to 1986, violations of offshore/onshore parity were much more marked for France and Italy than for the United States, Germany, the United Kingdom, and Japan, in the 1980s.


A representative recent paper is Hodrick and Srivastava (1986).


Note however that there is no incentive to arbitrage real rates of return. Real return equalization is predicted only where expected depreciation is (correctly) given by relative expected inflation, that is, where PPP governs the determination of exchange rates.


The fact that markets react to current account announcements does not necessarily indicate that capital mobility is low. If markets look to governments as a source of information and governments act as if financial constraints require current account balance, then the market will continue to react to deviations from balance since they imply changes in policy stance, and governments will feel justified in continuing to target the current account.


This case was elaborated by Schmitt (1979); the subsequent findings of Krugman and others in regard to the nature of international trade underline the relevance of this model (see Vines and Stephenson (1989)).


Both gross and net saving and investment have been used in the literature. The data are generally averaged over several years in order to avoid bias caused by the correlation of saving and investment over the business cycle.


Similar regressions for developing countries also show a significant correlation over time, although the coefficients are somewhat lower than that for industrial countries (Dooley, Frankel, and Mathieson (1987)).


These estimates use ordinary least squares. Typically researchers have found instrumental variables results to be similar to OLS.


Frankel (1989) reports that for regressions using data for the United States, the inclusion of the period 1984–87 significantly reduces the estimated correlations. However, Bayoumi (1990) does not find such an effect.


Feldstein and Bacchetta (1989) argue that Obstfeld’s model cannot explain the correlations when “realistic” parameter values are used.


Feldstein and Bacchetta (1989) disaggregate the data in the Summers study further and argue that they support the hypothesis that capital mobility is low.


Issues of data reliability suggest that cross-section correlations are more reliable for the gold standard period than correlations performed on the time series. However, it should be noted that Obstfeld (1986), using a different data source to Bayoumi’s, reports quite a high coefficient for a gold standard time series equation for the United Kingdom.


This model has been tested extensively on data for the United States. The overall conclusion is that the model works reasonably well as a first approximation, but that a significant proportion of consumption emanates from households that are liquidity constrained. These households consume out of current, rather than permanent, income. Tests for other countries have tended to reject the model more readily than for the United States (Hall (1988)).


For example, if a variable is projected using a first order autoregressive process, the first lag will contain all the information needed to project its future values.


Full data sets were not available for other countries. The interest rates are end-quarter data, while the other variables are quarterly averages. For each country the change in the interest rate was regressed on the current value and first lag of growth, inflation, and the current account ratio. Since the interest rate data are end-period, the use of current period data for targets is justified, although it does assume a short lag between changes in targets and changes in instruments.


Using a simple sign test, the probability of four coefficients all turning up negative is 6.25 percent, close to conventional significance levels.


However, these results are not robust to the inclusion of lags.


This length of time was chosen because it is long enough to produce reasonable coefficient estimates, but short enough to allow genuine changes in coefficients to become apparent.


Concepts such as the full employment deficit, which aim to take out these endogenous factors, depend upon the model used; furthermore, using such concepts in a reaction function assumes that governments disregard endogenous effects when choosing their fiscal stance.


General government data were used because central government data were only available for a few countries.


When contemporaneous growth and inflation are included in the regression, the coefficient on lagged growth falls to near zero, while the coefficient on inflation becomes significantly negative.


These results are not simply a product of Ricardian effects. Using similar data, Bayoumi (1990) finds a negative correlation between government and private saving, but the effect is not us powerful as the one documented here.


Using a simple one-tailed sign test this result is significant at the 10 percent level, but not at the 5 percent level.