The prices of farm products are crucial determinants of the extent of poverty and inequality in the world. The vast majority of the world's poorest households depend to a considerable extent on farming for their incomes, while food represents a large component of the consumption of all poor households. For generations, food prices have been heavily distorted by government policies in high-income and developing countries. Many countries began to reform their agricultural price and trade policies in the 1980s, but government policy intervention is still considerable and still favors farmers in...

to establish impact, attributing observed changes in welfare to the intervention, while identifying key factors of success. Impact evaluations are aimed at providing feedback to help improve the design of programs and policies. They also provide greater accountability and a tool for dynamic learning, allowing policymakers to improve ongoing programs and ultimately better allocate funds across programs. Such a causal analysis is essential for understanding the relative role of alternative interventions in reducing poverty. The papers in this section again adopt a variety of techniques. The rst...