Consensus estimates put the half-life of deviations from purchasing power parity (PPP) at about four years (Rogoff, 1996). However, conventional least squares estimates of half-lives are biased downward. Accordingly, as a preferred measure of the persistence of real exchange rate shocks, this...

In the aftermath of the Covid pandemic rising commodity prices went hand-in-hand with a strengthening US dollar. This was a sharp contrast to the usual relationship between commodity prices and the dollar. This paper presents evidence that post-Covid correlation patterns could become more common...

The role of the exchange rate under inflation targeting (IT) remains an unresolved issue in literature and policy discussions -and a challenge for central banks implementing IT, especially in developing countries. This paper aims at assessing whether there is a relation between the nominal...

Using the indexes we developed (Aizenman, Chinn, and Ito, 2008) to measure the degree of the three policy choices countries make with respect to the trilemma: exchange rate stability, monetary independence, and capital account openness, we investigate the normative questions pertaining to the...

We develop a methodology that intuitively characterizes the choices countries have made with respect to the trilemma during the post Bretton-Woods period. The paper first outlines the new metrics for measuring the degree of exchange rate flexibility, monetary independence, and capital account...

This paper reviews three different concepts of equilibrium exchange rates that are widely used in policy analysis and constitute the backbone of the IMF CGER assessment: the Macroeconomic Balance, the External Sustainability and the reduced form approaches. We raise a number of econometric...

We study the apparent disconnect between what countries announce to be their exchange rate regime and what they de facto implement. Even though discrepancies between announcements and de facto polices are frequent, there is a lack of understanding of actual patterns and underlying reasons. We...

Tiny changes in the American monetary policy can have dramatic effects on the rest of the world because of dollar's double role of national and international currency. This is the Triffin dilemma. The paper shows how it works through three examples: price of commodities, dollarization, and the...

The present paper extends the Obstfeld and Rogoff (2005) framework of current account imbalances by the oil exporting countries as a fourth region. It sets the stage for a variety of analysis that can be conducted within a four-region-setting that accounts for the importance of OPEC as a major...

this paper analyzes two effects which might have an important impact on a reduction of global external imbalances. These are valuation effects on the one hand and interest rate effects on the other hand. We use a four-region model that is based on the models by Obstfeld and Rogoff (2005) and...