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Chapter 10

Target-Zone Models

This chapter covers a class of exchange rate models where the central bank of a small open economy is, to varying degrees, committed to keeping the nominal exchange rate within speciÞed limits commonly referred to as the target zone. The target-zone framework is sometimes viewed in a di erent light from a regime of rigidly Þxed exchange rates in the sense that many target zone commitments allow for a wider range of exchange rate variation around a central parity than is the case in explicit pegging arrangements. In principle, a target-zone arrangement also requires less frequent central bank intervention for their maintenance. Our analysis focuses on the behavior of the exchange rate while it is inside the zone.

The target-zone analysis has been used extensively to understand exchange rate behavior for European countries that participated in the Exchange Rate Mechanism of the European Monetary System during the 1980s where ßuctuation margins ranged anywhere from 2.25 percent to 15 percent about a central parity. The adoption of a common currency makes target-zone analysis less applicable for European issues. However, there remain many developing and newly industrialized countries in Latin America and Asia that occasionally Þx their exchange rates to the dollar for which the analysis is still relevant. Moreover, there may come a time when the Fed and the European Central Bank will establish an informal target zone for the dollar—euro exchange rate.

Target-zone analysis typically works with the monetary model set in a continuous time stochastic environment. Unless noted otherwise,

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