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Reforms in recent decades have sharply reduced the distortions affecting agriculture in developing countries, particularly by cuts to agricultural export taxes and by some reductions in government assistance to agriculture in high-income countries, but international trade in farm products continues to be far more distorted than trade in nonfarm goods. This paper summarizes a series of empirical studies that focus on the effects of the remaining distortions to world merchandise trade for poverty and inequality, especially in developing countries. To obtain different insights into the various impacts, two global studies are undertaken using the World Bank's Linkage model, one multi-country study uses the Global Trade Analysis Project (GTAP) model, and ten country case studies are also included, each using a national economy-wide model. The Linkage model results suggest that liberalization will reduce international inequality, largely by boosting farm incomes and raising real wages for unskilled workers in developing countries, and will reduce the number of poor people worldwide by 3 percent. The analysis based on the GTAP model for a sample of 15 countries, and the ten stand-alone national case studies, all point to larger reductions in poverty, especially if only the non-poor are subjected to increased income taxation to compensate for the loss of trade tax revenue.

This paper analyzes the economic effects of agricultural price and merchandise trade policies around the world as of 2004 on global markets, net farm incomes, and national and regional economic welfare and poverty, using the global economy wide Linkage model, new estimates of agricultural price distortions for developing countries, and poverty elasticity's approach. It addresses two questions: to what extent are policies as of 2004 still reducing rewards from farming in developing countries and thereby adding to inequality across countries in farm household incomes? Are they depressing value added more in primary agriculture than in the rest of the economy of developing countries, and earnings of unskilled workers more than of owners of other factors of production, thereby potentially contributing to inequality and poverty within developing countries (given that farm incomes are well below non-farm incomes in most developing countries and that agriculture there is intensive in the use of unskilled labor)? Results are presented for the key countries and regions of the world and for the world as a whole. They reveal that, by moving to free markets, income inequality between countries will be reduced at least slightly, all but one-sixth of the gains to developing countries will come from agricultural policy reform, unskilled workers in developing countries the majority of whom work on farms will benefit most from reform, net farm incomes in developing countries will rise by 6 percent compared with 2 percent for non-agricultural value added, and the number of people surviving on less than US$1 a day will drop 3 percent globally.

Earnings from farming in many developing countries have been depressed by a pro-urban bias in own-country policies as well as by governments of richer countries favoring their farmers with import barriers and subsidies. Both sets of policies, which reduce national and global economic welfare and contribute to global inequality and poverty, have been undergoing reform since the 1980s. Using the linkage model of the global economy and modifications to the pre-release of version 7 of the Global Trade Analysis Project (GTAP) protection database for 2004, this paper seeks to compare the effect of those reforms to date with those that would come from removing remaining agricultural and trade policies. Two sets of results are thus presented: one showing the effects of policy reforms between 1980-84 and 2004, the other showing what the removal of remaining distortions as of 2004 could be. Both sets of results indicate improvements in the real value of agricultural output and exports, the real returns to farm land and unskilled labor, and real net farm incomes in most developing country regions despite the adverse effect on the international terms of trade for some developing countries that are net food importers or are enjoying preferential access to agricultural markets of high-income countries. Landowners in those high-income countries still offering their farmers price supports could readily afford to compensate them from the benefits of removing remaining agricultural protectionism.

A political economy model of protection is used to determine endogenously the intersectoral patterns of protection. Three propositions are derived that are consistent with the stylized patterns of tariff protection in rich and poor countries: Nominal protection rates escalate with the degree of processing, protection is higher on average in poor countries, and rich countries protect agriculture relatively more than they protect manufacturing, whereas poor countries do the reverse. Numerical simulations for archetypal rich and poor economies confirm that the endogenously determined structure of protection is broadly consistent with observed patterns of protection.