"For decades the world's agricultural markets have been highly distorted by national government policies, but very … differently for different commodities. Hence a weighted average across countries of nominal rates of assistance or consumer tax … restrictiveness indexes. It then exploits a global agricultural distortions database recently compiled by the World Bank to generate …

countries or high-income countries as a group, or for the world as a whole. This paper seeks to fill this gap. The paper begins … by describing the overall project's coverage of 30 major commodities and their importance in regional and global … those commodities are only a small share of global production and exports of farm products, they can be crucial to the food …