This paper identifies the effects of preferential trade agreements on trade volumes and prices using detailed trade and tariff data.It identifies demand elasticities by developing a difference in differences based method that exploits the fact that the additional wedge driven between consumption patterns in a liberalizing versus a non-liberalizing country is directly related to the tariff reduction.Supply elasticities are identified by using tariffs as instruments for observed quantities.Analysis of world-wide trade data for 5,000 commodities shows that NAFTA and CUSFTA have had a substantial impact on international trade volumes, but a modest effect on prices and welfare.NAFTA and CUSFTA increased North American output and prices in many highly-protected sectors by driving out imports from non-member countries.
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