Bachelor of Science (Agriculture) Iowa State University, 1966. Master of Arts, Doctor of Philosophy University Chicago, 1971, 1972.
Lector, University Illinois, Chicago Circle, Chicago, 1970-1972. Assistant Professor, Oklahoma State University, 1972-1974. Assistant Professor, Association Professor, Iowa State University,
Visiting Fellow, Research Association, Yale University, 1980-1981. Professor of Economics, Iowa State University, Ames, Iowa, United States of America, since 1982. Editorial Board, N. Central J. Agriculture Economics, 1978-1981.
Association Editor, American Journal of Agricultural Economics, since 1983.
Early research provided initial econometric evidence that farmers’ schooling and agricultural extension enhance allocative performance, farmers’ responses to relative price changes, adoption of new technology and cultural practices. The results produced valuable evidence against the hypothesis that schooling only signals innate ability. Next, production functions fitted to agricultural data yielded estimates of marginal products of agricultural extension, labour, and other inputs.
The estimates of the marginal product of extension were a new contribution. Subsequent work, which treated research and extension as endogenous variables, has provided pioneering econometric estimates of demand functions for these publicly provided services. Analogous to decisions of firms, models of households’ choices have been developed on a range of resources, contributing to the devel opment of the new home economics.
Research has focussed upon modelling and providing econometric evidence for the demand for household capital services, and the supply of husband’s and wife’s off-farm work. New estimates of off-farm labour-supply functions and of substitution possibilities between physical capital and labour in household production were obtained. The research applies multiple-sample selection techniques to multiple-equation econometric models.
Current research focusses upon United States-Mexican trade in fresh agricultural commodities and illegal immigrants. Included are theoretical and empirical modelling of endogenous regulation of illegal immigration and commodity trade, and of trade equations for fresh vegetables and labour services. Other work concerns the historical support and performance — intermediate and final products — of the United States agricultural experiment station system and the market for new agricultural scientists.
Another interest is econometric exploration of United States and United Kingdom monetary history.