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Exchange Rate Determination Model

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Exchange rate determination model as discussed by Alan C. Stockman
A. Stockman did propose an alternative equilibrium explanation of ex- change rate behavior. The explanation is based on a model of the simultaneous determination of exchange rates and relative prices of different goods in international trade in an intertemporal framework with uncertainty and rational expectations. The model emphasizes the role of relative price changes, caused by real disturbances, in determining the behavior of exchange rates and integrates the important issues discussed by the traditional "elasticity theorists" into a general equilibrium framework.
2. In the model developed in his paper, explains exchange rates may be volatile and can exhibit auto correlated deviations from purchasing power parity, even though prices freely adjust to clear markets. Ex- change rate changes may appear to cause relative price changes and generate additional uncertainty even when all markets are in equilibrium. Nevertheless ,the relationship between the exchange rate and the terms of trade cannot be exploited by government exchange rate policies.-'
3. The model shows how a change in the terms of trade caused by relative supply or demand shifts is divided between nominal price changes in each country and an exchange rate change, creating a correlation between the exchange rate and the terms of trade. The greater the changes in the terms of the trade and the larger the role of changes in the exchange rate in effecting these terms of trade changes, the greater the variability of exchange rates. The more persistent the shifts in the supplies or demands for goods, the more persistent the deviations from purchasing power parity. Besides rationalizing exchange rate volatility and auto correlated deviations from purchasing power parity, the model has several other implications.
The correlation of the exchange rate with the terms of trade will be greater for countries with more homogeneous monetary policies. Exchange rate changes caused by monetary factors will not affect the terms of trade.
4 .The model implies that deviations from purchasing power parity and changes in the terms of trade have roughly the same characteristics and bear approximately the same relationship to each other under both fixed and flexible exchange rate systems.

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