Exchange Rate Volatility Under Peg: Do Trade Patterns Matter?

This paper assesses the role of trade patterns in shaping the volatility of the effective exchange rate under two alternative peg regimes: a hard peg to a single currency and a peg to a basket of currencies. I link the changes in the nominal effective exchange rate of a pegged currency to the fluctuations of its anchor vis-a-vis other major currencies, with an emphasis on the dynamics of trade patterns. In an application to the WAEMU (West African Economic and Monetary Union), I find that the nominal effective exchange rate of the union was twice as volatile under the hard peg to the euro as it would have been under a hypothetical basket peg over the past decade. This result was driven by the substantial shifts that occurred in WAEMU trade patterns, away from euro area countries and toward the "BICs" (Brazil, India, and China). These findings suggest that policymakers should pay as much attention to the type of peg as to pegging in itself, with a particular focus on the dynamics of trade patterns.