The years following World War II have witnessed an increasing interest in the effects of growth on trade, the patterns of international specialization, and the terms of trade. On the one hand, some English economists have maintained the Ricardian tradition of diminishing returns, rising food prices and, therefore, declining British terms of trade, while, on the other hand Prebisch, Singer, and other critics have attempted to document and explain a long-run decline in the terms of trade of the underdeveloped countries. Finally, in a reaction to this concentration on a single factor as the...