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Mr. Joel Slemrod and Shlomo Yitzhaki

It is argued that taxation causes deadweight losses—from substitution, evasion, and avoidance activities—and direct, administrative and compliance, costs. Some of these social costs tend to be discontinuous and/or nonconvex. Because most models of taxation ignore some components of the social costs of taxation, their conclusions cannot be considered all-encompassing. An alternative approach to policy evaluation is to rely on a marginal efficiency cost of funds rule that can indicate appropriate directions of reforms. The paper discusses the merits, applicability, and limitation of this rule, as well as its relationship to other concepts,

Mr. Charles Y. Mansfield

IN CONSIDERING CRITERIA for a tax system in a developing country the response of tax revenue to changes in income has often been singled out as a vital ingredient.1 This response is measured by the concepts of tax elasticity and tax buoyancy, the former measuring in some sense the automatic response of revenue to income changes (i.e., revenue increase, excluding the effects of discretionary changes), and the latter measuring the total response of tax revenue to changes in income. A high tax elasticity is said to be a particularly desirable attribute, as it allows growth in expenditure, preferably related to development, to be financed by rising tax revenue without the need for politically difficult decisions to raise taxes. However, in fact, major sources of government revenue may have a low elasticity, in which case the authorities must seek additional revenue by introducing discretionary changes. Then, growth in tax revenue may come about through a high buoyancy 2—including growth through discretionary changes—as opposed to the natural growth through elasticity. Using Paraguay as an example, this paper analyzes the growth of tax revenues over the 1962-70 period—an era of conscious tax reform—by examining two major questions: (1) what was the elasticity of the system and its components, and how is the size of the elasticity coefficient explained? and (2) what was the buoyancy of the system relative to its elasticity? With respect to individual taxes, where were the major differences between buoyancy and elasticity found? These latter questions point to the effect of discretionary changes.

Mr. Vito Tanzi

It has often been argued that many developing countries, in their pursuit of growth through capital accumulation, may have no choice but to run fiscal deficits in order to finance their development expenditures. The reasons given are: (a) that their tax bases are inadequate to allow a high tax burden; (b) that even when adequate tax bases are available, the countries’ tax administrations are too inefficient to take advantage of them; or (c) that, in any case, the political realities are such that high tax burdens are not possible.1 In the absence of developed capital markets or external borrowing, these fiscal deficits are often financed wholly or partly by central banks (i.e., through money creation). This printing of money brings about increases in the general price level and thus reduces the real value of the monetary unit. This reduction can be seen, as Friedman and Bailey showed many years ago, as a kind of tax on those who are holding money.2

Mr. Vito Tanzi

The sensitivity (i.e., elasticity and built-in flexibility) of the U. S. individual income tax to changes in national income is of great interest to researchers and policymakers. However, the direct measurement of this sensitivity—that is, the measurement obtained from time-series observations of the relevant variables—has always been difficult, and even at times impossible, because changes in the legal structure of the tax have been too frequent to provide enough observations that relate to the same legal structure to allow statistically significant coefficients to be determined. This was particularly true in the United States before 1954, when the rates were changed frequently; it has also been true since 1963, when important changes occurred in rates, personal exemptions, deductions, and other features. In contrast, during the period between 1954 and 1963, hardly any significant statutory changes occurred in the tax.