What is the optimal number of currencies in the world? Common currencies affect trading costs and, thereby, the amounts of trade, output, and consumption. From the perspective of monetary policy, the adoption of another country's currency trades off the benefits of commitment to price stability...

In this paper I discuss some of the most important lessons on exchange rate policies in emerging markets during the last 35 years. The analysis is undertaken from the perspective of both the Latin American and East Asian nations. Some of the topics addressed include: the relationship between...

The purpose of this paper is to investigate why the choice of invoice currency under exchange rate uncertainty depends not only on expectations but also on history. The analysis is motivated by the fact that the U.S. dollar has historically been the dominant vehicle currency in developing...

Foreign currency borrowing is perceived as a source of financial instability in emerging markets. We propose a theory where liability dollarization arises from an insurance motive of domestic savers. Because financial crises are associated with currency depreciations, savers are reluctant to...

Unlike the financial dollarization (FD) of external liabilities, the dollarization of domestic financial assets (domestic FD) has received comparatively less attention until very recently, when it has been increasingly seen as a key source of balance sheet exposure. This paper focuses on a...

Foreign exchange reserve accumulation has risen dramatically in recent years. The introduction of the euro, greater liquidity in other major currencies, and the rising current account deficits and external debt of the United States have increased the pressure on central banks to diversify away...

Emerging markets do not handle adverse shocks well. In this paper, we lay out an argument about why emerging markets are so fragile, and why they may adopt contractual mechanisms -such as a dollarized banking system- that increase their fragility. We draw on this analysis to explain why...

In this paper I investigate the historical record of countries that have lived under a 'dollarized' monetary system. As it turns out, this is a very small group of counties, most of which have operated under very special circumstances, and for which there are very limited data. The results...

Exchange rate policies depend on portfolio choices, and portfolio choices depend on anticipated exchange rate policies. This opens the door to multiple equilibria in policy regimes. We construct a model in which agents optimally choose to denominate their assets and liabilities either in...

In this paper we analyze whether common currency' countries that is, dollarized and independent currency union countries have outperformed countries that have a currency of their own. The paper is empirical and estimates jointly the probability of being a common currency country and outcome'...