Starting with Romer [1987] and Rivera-Batiz-Romer [1991] economists have been able to model how trade enhances growth through the creation and import of new varieties. In this framework, international trade increases economic output through two channels. First, trade raises productivity levels...

Groundnut products are of central economic importance to millions of smallholders in Africa, India, and Southern China. The products generate 60 percent of rural cash income and account for about 70 percent of the rural labor force in Senegal and The Gambia. Groundnut trade is heavily distorted,...