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Choosing an Exchange Rate Regime

Finance & Development, December 2009, Volume 46, Number 4

Atish R. Ghosh and Jonathan D. Ostry

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A new look at an old question: Should countries fix, float, or choose something in between?


A PERENNIAL question in international economics—whether in academia or in policy circles—concerns the optimal choice of exchange rate regime. After the breakdown of the Bretton Woods system in the early 1970s, and the subsequent adoption of the Second Amendment to the IMF’s Articles of Agreement, member countries have been free to adopt the exchange rate regime of their choice.

But because countries no longer are obligated to peg their exchange rates in a system overseen by the IMF, they need a sound basis for selecting the regime best suited to their needs—be it fixed, floating, or intermediate. Over the past decade, the IMF has produced three major analytical studies on countries’ choices of exchange rate regime—in 1999, 2003, and 2009 (Mussa and others, 2000; Rogoff and others, 2004; and Ghosh, Ostry, and Tsangarides, forthcoming)—that build on the existing empirical literature both within and outside the IMF (Ghosh and others, 1997; Ghosh, Gulde, and Wolf, 2002; Levy-Yeyati and Sturzenegger, 2003; and Reinhart and Rogoff, 2004). These reviews, part of the IMF’s surveillance mandate, help inform member countries of how their choice of exchange rate regime can affect their own macroeconomic performance—inflation, growth, susceptibility to crises—and contribute to the stability of the international monetary system.

Evolving views

In practice, the preferred exchange rate regime, particularly for developing and emerging market economies, has evolved considerably over the past couple of decades. Pegging the exchange rate to a strong anchor currency (often the dollar or the deutsche mark) was popular in the early 1990s—especially for nations in transition from command to market economies that were seeking to stabilize their economies after their initial price liberalizations. But the 1990s also saw a spate of capital account crises in emerging market countries, with sharp reversals of capital inflows leading to collapsing currencies and underscoring the fragility of such fixed exchange rate regimes.

By the time of the 1999 IMF review of exchange rate regimes, the received wisdom was that simple pegs were too prone to crisis and that countries should adopt either “hard” pegs—such as monetary unions or currency boards—or, at the other end of the spectrum, free floats in which the market determines a currency’s value without government intervention.

This so-called bipolar prescription, intended primarily for emerging market and developing countries, was much the same choice that the advanced economies were making. Many of those advanced economies were headed toward hard pegs in the form of a monetary union, while others were free floating. Some, indeed, managed to do both: countries in the euro bloc have a hard peg (a currency union) with other members of the bloc, but the euro itself floats against third currencies.

The bipolar prescription for emerging market countries proved short lived, however. The collapse in 2002 of Argentina’s hard peg (the currency board, which linked domestic peso issuance to dollars in the central bank) cast doubt on the hard end of the bipolar spectrum.

Fear of floating

The 2003 review used a de facto classification of exchange rate regimes that was based on the actual behavior of the exchange rate rather than on what formal, or de jure, commitment the central bank had made. The 2003 review found that pegged exchange rates provided little benefit to emerging market countries in terms of either inflation or growth performance. Because such regimes are associated with greater likelihood of currency or financial crises, the review concluded that emerging market countries—and developing countries as they became more financially integrated—should adopt freely floating exchange rates.

But in practice, few central banks were (or are, for that matter) willing to follow such a policy of benign neglect because they cannot be indifferent to the value of their currency. When the value of the currency declines, authorities worry about both imported inflation and the balance sheet effects of an exchange rate depreciation on borrowers that have borrowed in foreign currency and suddenly find that debt more expensive to service. On the other hand, when a currency’s value rises, there is a loss of export competitiveness.

This fear of floating, as it has been called, is particularly prevalent among emerging market and developing countries for which sharp appreciations or depreciations of the exchange rate—or, more generally, currency volatility—may be particularly deleterious. But it is also noteworthy that among advanced economies, euro area members avoid currency volatility by maintaining irrevocably fixed exchange rates (through the monetary union) with the countries with which they have the deepest economic ties, such as trade.

In sum, the bipolar prescription ruled out intermediate regimes (including simple pegs), the collapse of Argentina’s currency board ruled out the hard end of the spectrum, and in practice few countries were willing to go to the soft end of free floating. So which regime should a country adopt? It was clearly time for a fresh look at this question.

What they do and what they promise to do

The just-completed review, based on a data set of IMF member countries over the period 1980–2006, is the most comprehensive study of exchange rate regimes. Not only does this study examine the impact of the exchange rate regime on a wider range of variables (monetary and fiscal policies, inflation, output growth and volatility, cross-border trade and capital flows, crisis susceptibility, and external adjustment) than did the earlier reviews, it is also the first to use both de jure (what they promise to do) and de facto (what they do) classifications of the exchange rate regime in its analysis.

As a result, the message about the relative merits of various exchange rate regimes is more nuanced than those in the earlier reviews.

Inflation performance

There is ample evidence that, for developing and emerging market countries, pegged exchange rate regimes are associated with the best inflation performance. The only exception occurs when the peg is at an undervalued rate and the country is unable to offset the growth of the money supply that occurs when persistent current account surpluses and resulting accumulation of foreign reserves translate into excessive monetary growth; in such cases (a small minority in the IMF data set), the inflation benefit from pegs does not occur.

The inflation benefit from pegged regimes may seem at odds with the findings of the 2003 study, which found that emerging economies captured little inflation benefit from pegging. The explanation is straightforward and results from the 2009 study’s use of both de jure and de facto classifications of the exchange rate regime, whereas the 2003 review focused exclusively on the de facto classification. An important part of a peg’s inflation benefit comes from the credibility of a formal commitment by the central bank to maintain the parity—not just from its de facto foreign exchange intervention or the behavior of the exchange rate. In nearly every case in which the central bank makes a formal commitment to a pegged exchange rate regime, it in fact maintains that peg. In other words, when it comes to pegging the exchange rate, deeds nearly always back words. The opposite case—a de facto peg without a de jure commitment—is much more common but does not deliver the same benefit in terms of anchoring inflation expectations and reducing inflation. By using both de jure and de facto classifications, the 2009 study was able to pick up on such subtleties, which were missed in earlier reviews.

How growth fares

Growth performance is best under intermediate exchange rate regimes—those that maintain relatively rigid exchange rates but do not formally peg to a single anchor currency. This is largely because such intermediate regimes represent a happy balance between pegs and free floats. Pegged regimes are associated with lower inflation, lower nominal and real exchange rate volatility, and greater trade openness—all of which are associated with faster growth. But pegged regimes are also more susceptible to exchange rate overvaluation, which hurts competitiveness and undermines growth performance.

Compared with pegged regimes, floating exchange rates are at less risk for overvaluation, but they also fail to deliver low inflation, reduced volatility, or better trade integration.

Between these extremes, intermediate regimes achieve the best balance and are associated with faster per capita output growth of about half a percentage point a year (after taking into account other factors that affect growth). Pegged exchange rate regimes are associated with better growth performance than floating regimes—but only if they are able to avoid real exchange rate overvaluation and loss of competitiveness.

Trade links

That countries in a monetary union have deeper trade links is well known. But the 2009 study establishes that similar benefits for trade integration derive from simple pegs (and, to a lesser degree, even from intermediate regimes). The study also finds that—crises aside—capital flows under pegged and intermediate regimes tend to be more consistent with consumption smoothing than capital flows under floats. While this latter finding is less sharply defined, one explanation is that the lower real exchange rate volatility under more rigid regimes fosters greater “stable” forms of capital flows—such as foreign direct investment—than “hot money” portfolio flows. Indeed, promoting greater trade and cross-border investment was the economic motivation behind fixed exchange rates and eventual monetary union in Europe.

Some trade-offs

Nothing is perfect, of course. The study found three major downsides to more rigid (pegged or intermediate) exchange rate regimes.

First, such regimes (especially pegs) severely constrain the use of other macroeconomic policies. The “impossible trinity” of simultaneously maintaining a pegged exchange rate, an open capital account, and an independent monetary policy is well established. What is striking in the 2009 study is that this constraint seems to hold, even for countries with less-open capital accounts or those that heavily sterilize reserve flows under pegs. The other striking result is that countercyclical fiscal policy—cutting taxes and increasing government spending to counter economic downturns and vice versa—is also heavily constrained under pegged exchange rate regimes. This presumably happens because capital flows are related to the business cycle in most emerging market and developing countries. Because expansionary fiscal policy in a downturn could lead to a loss of confidence and trigger further capital outflows, which would threaten the viability of the peg, there is less scope for countercyclical fiscal policy in countries with pegs. Thus, while pegging the exchange rate provides a useful commitment device for the central bank to anchor expectations by disciplining policies, it also limits the potential to respond to macroeconomic shocks.

Second, both the 1999 and 2003 studies found that pegged (and intermediate) regimes are associated with greater susceptibility to currency and financial crises, such as debt crises, a sudden stop in capital inflows, or banking crises. The current study confirms these results, especially for developing and emerging market countries with more open capital accounts. But it also finds that credit booms, including those that end in crisis, are about as likely to occur under floating regimes as they are under pegged or intermediate regimes. Likewise, the study finds that the risk of a growth crisis (a sharp decline in growth for whatever reason) is not correlated with the exchange rate regime. Thus, greater crisis susceptibility is a cost of more rigid exchange rate regimes. But countries with floating regimes are not entirely immune—as indeed the current global crisis, with its epicenter in countries with floating regimes, has amply demonstrated.

Third, pegged and intermediate exchange rate regimes impede timely external adjustment. On the deficit side, more rigid regimes are associated with larger deficits that unwind more abruptly and, because the real exchange rate does not adjust, have a greater impact on output and economic activity than deficits under floating regimes. On the surplus side, these regimes are associated with large and highly persistent surpluses that, if large enough in the aggregate, can affect the stability of the overall international monetary system.

The bottom line

Unlike previous reviews, the current study finds important trade-offs in the choice of exchange rate regimes. Regimes that are more rigid help countries anchor inflation expectations, sustain output growth, and foster deeper economic integration. But they also constrain the use of macroeconomic policies, increase vulnerability to crisis, and impede external adjustment. This trade-off is illustrated by the recent experience of European emerging market countries. Although many of the countries with less flexible regimes enjoyed strong growth in the years leading up to the present crisis, they also built up large external imbalances, increasing their vulnerability to abrupt and disruptive adjustment and limiting their potential for countercyclical macroeconomic policies.

At its core, the results of the 2009 IMF review and the trade-offs it finds should

  • help bring greater balance to the debate over which exchange rate regimes are appropriate for which countries,
  • allow the IMF greater latitude to take account of country-specific circumstances when tailoring the policy advice it gives to individual countries, and
  • provide a wealth of information and empirical results to help the IMF’s 186 member countries make better-informed choices for themselves regarding the best choice of exchange rate regime.


Ghosh, Atish R., Anne-Marie Gulde, Jonathan D. Ostry, and Holger Wolf, 1997, “Does the Nominal Exchange Rate Regime Matter?” NBER Working Paper 5874 (Cambridge, Massachusetts: National Bureau of Economic Research).

Ghosh, Atish R., Anne-Marie Gulde, and Holger Wolf, 2002, Exchange Rate Regimes: Choices and Consequences (Cambridge, Massachusetts: MIT Press).

Ghosh, Atish R., Jonathan D. Ostry, and Charalambos Tsangarides, forthcoming, Toward a Stable System of Exchange Rates, IMF Occasional Paper (Washington: International Monetary Fund).

Levy-Yeyati, Eduardo, and Federico Sturzenegger, 2003, “To Float or to Fix: Evidence on the Impact of Exchange Rate Regimes,” American Economic Review, Vol. 93, No. 4, pp. 1173–93.

Mussa, Michael, Paul Masson, Alexander Swoboda, Esteban Jadresic, Paolo Mauro, and Andrew Berg, 2000, Exchange Rate Regimes in an Increasingly Integrated World Economy, IMF Occasional Paper 193 (Washington: International Monetary Fund).

Reinhart, Carmen, and Kenneth Rogoff, 2004, “The Modern History of Exchange Rate Arrangements: A Reinterpretation, The Quarterly Journal of Economics, Vol. 19, No. 1, pp. 1–48.

Rogoff, Kenneth, Aasim Husain, Ashoka Mody, Robin Brooks, and Nienke Oomes, 2004, Evolution and Performance of Exchange Rate Regimes, IMF Occasional Paper 229 (Washington: International Monetary Fund).

Atish R. Ghosh is Chief, Systemic Issues Division, and Jonathan D. Ostry is Deputy Director in the IMF’s Research Department.

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