In light of the substantial movement towards trade liberalization duri
ng the postwar period, this paper attempts to determine if, and when,
countries experienced statistically significant changes in the paths o
f their export-GDP and import-GDP ratios. We find that: (1) most trade
ratios exhibited a structural break in their time paths; (2) postbrea
k trade exceeded prebreak trade for the majority of countries; (3) the
coincidence in timing between the import and export breaks does not a
ppear to be particularly strong, and; (4) there is little relation bet
ween the extent of changes in imports and the extent of changes in exp
orts for most countries. (C) 1997 Elsevier Science B.V.