Economic integration, market size and the welfare effects of trade liberalisation

Economic Integration, Market Size and the Welfare Effects of Trade Liberalisation. — This paper examines the welfare effects of regional and global integration in a model where market size matters. Regional integration leads to higher welfare in the countries of a preferential trading arrangement (PTA), but to lower welfare outside. In case the countries also decide to form a customs union (CU), both countries will experience further gains if the creation of the CU means that the average external trade barriers are raised. In turn, the outside country will in this case experience further welfare losses. If it retaliates and creates a trade war, this will lower welfare in all countries. In contrast, global integration mostly benefits both PTA countries and outside countries.