This paper contributes to analysis of the extent to which multilateral trading agreements reached under GATT can liberalize the world economy. Its main conclusion is that free trade is not sustainable if production is fixed exogenously and utility is non-transferable. If production is fixed and...

This paper analyses the extent to which preferential trade agreements can lead to the substitution of non-tariff barriers for tariffs, and the effects of non-tariff barriers on welfare and other parameters. Its main results are that non-tariff barriers reduce aggregate welfare, and that the...