Convergence Rates to Purchasing Power Parity for Traded and Nontraded Goods

This article estimates the speed of the adjustment coefficient in structural error-correction models. We use a system method for real exchange rates of traded and nontraded goods by combining a single-equation method with Hansen and Sargent's instrumental variables methods for linear rational expectations models. We apply these methods to a modified version of Mussa's model. Our results show that the half-lives of purchasing power parity deviations for the rates of traded goods are less than 1 year and are shorter than those for general price and for nontraded goods in most cases, implying a faster adjustment speed to parity.

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