Evidence on Structural Change in the Demand for Aggregate U.S. Imports and Exports

Abstract

Earlier work on U.S. import demand suggest that structural change may have occurred sometime in the mid-1960s. Since this evidence was based upon a somewhat arbitrary splitting of the sample period, the dating of change is uncertain. In this paper we investigate the question of structural change for both U.S. imports and exports, using a procedure that lets the data determine if and when structural change may have occurred. We find weak evidence of structural change for imports in the mid- to late 1960s and much stronger evidence in 1972:1 and thereafter. There is no evidence of structural change for exports.

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