Commodity levies are used increasingly to fund producer collective goods such as research and promotion. In the present paper we examine theoretical relationships between producer and national benefits from levy-funded research, and consider the implications for the appropriate rates of matching...

Commissioned by the CGIAR Science Council and prepared as a Background Paper for the 2008 World Development Report of the World Bank.

Replaced with revised version of paper 07/10/09.

CONTEXT -- A Brief History of U.S. Agriculture -- INPUTS, OUTPUTS AND PRODUCTIVITY -- Agricultural Inputs -- Agricultural Outputs -- Agricultural Productivity Patterns -- AGRICULTURAL R&D FUNDING AND POLICIES -- Research Funding and Performance -- The Federal Role -- MODELS OF R&D AND...