In light of the substantial movement towards trade liberalization during the postwar period, this paper attempts to determine if, and when, countries experienced statistically significant changes in the paths of their export-GDP and import-GDP ratios. We find that: (1) most trade ratios exhibited a structural break in their time paths; (2) postbreak trade exceeded prebreak trade for the majority of countries; (3) the coincidence in timing between the import and export breaks does not appear to

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... e particularly strong, and; (4) there is little relation between the extent of changes in imports and the extent of changes in exports for most countries. J.E.L. classifications: C22, F1 Country Break Year Model SupF T Country Break Year Model SupF T Column reflects the percent changes in postbreak to prebreak trade-output shares.