This paper focuses on the private and social rates of return to R&D capital in the three vertically linked sectors, primary agriculture, food processing, and farm machinery and equipment. Evidence supporting a divergence between these rates is found for primary agriculture and food processing....

Huffman, W.E., E. Ball, M. Gopinath, and A. Somwaru, "Public R&D and Infrastructure Policies: Effects on Cost of Midwestern Agriculture," in V. Eldon Ball and G. Norton, eds. Agricultural Productivity: Measurement and Sources of Growth. Kluwer Academic Press, 2002, pp. 167-184.