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We thank Eldon Ball of the USDA for the TFP data, Robert Evenson of Yale University, and Daniel Johnson of Wellesley College for the patent variables, and Han Roseboom of ISNAR for providing research expenditure data. We thank Daniel Johnson, Walter Park, and all the participants for helpful comments, and especially Robert Evenson, who influenced the final form of the paper. David Hadley of University of Reading, Rob Townsend of the World Bank, and Ellen Bielema and Charlie Hallahan at USDA provided excellent econometric assistance. The views expressed are not necessarily those of the USDA","Professor, Department of Agricultural and Food Economics, University of Reading, England, and Ex- traordinary Professor, Department of Agricultural Eco- nomics, Extension and Rural Development, University of Pretoria, Republic of South Africa Phone 44-1 18-9-3 18965,","Professor, Department of Agricultural and Food Economics, University of Reading, England, and Ex- traordinary Professor, Department of Agricultural Eco- nomics, Extension and Rural Development, University of Pretoria, Republic of South Africa Phone 44-1 18-9-3 18965, Fax -44- I 18-9-756467 E-mail C.G.Thirtle@reading.ac.uk","University of Reading, Reading, United Kingdom"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"*Previous versions of this paper have been presented at the Western Economic Association International 72nd Annual Conference, Seattle, Wash., July 12, 1997 (session organized by Caswell and Schimmelpfennig); the 1997 Economic Research Service and Farm Foundation sponsored workshop on \u201cPublic-Private Collaboration in Agricultural Research\u201d; the 1998 annual meeting of the ASS A in Chicago; the 1998 NC208/CIMMYT conference at El Baton, Mexico; and the 1998 annual conference of the Agricultural Economics Society at Reading, England. 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