Recognition of the importance of data transparency—including for promoting the efficient operation of financial markets and policy accountability on the part of governments and central banks—is a remarkably recent phenomenon in the history of economic thought. The timely availability of data on international reserves and the foreign exchange operations of central banks is a case in point. As recently as 10 years ago, with relatively few exceptions, only very aggregated information typically was available, and then often only with a substantial lag. Indeed, in a number of countries, these data were treated as state secrets. Moreover, significant regional differences existed—and still do, to an important degree—in terms of views about the value of enhancing transparency.
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