Figure 1. Average income per capita and commodity ranking of major food crop production in developing countries.

Note: Average income per capita = the average, over all developing countries, of proportion of overall production of the crop in each country multiplied by that country’s per capita GNP.
Source: Constructed from annual data for production 1995-97 from FAOSTAT, September 1998, and the World Bank 1998/99 World Development Report.