Lindon J. Robison and Marcelo E. Siles are, respectively, Professor in the Department of Agricultural Economics and Senior Research Associate at the Julian Samora Research Institute at Michigan State University. Support for this report was provided by the Michigan Agricultural Experiment Station and the Julian Samora Research Institute, Michigan State University, East Lansing, Michigan. The authors appreciate the valuable comments of and discussions with James Bonnen, Carl Eicher, Steve J. Gold, Julie Howard, Lester Manderscheid, Jack Meyer, Robert Myers, Refugio Roehin, Allan Schmid, and John Staatz. We are also grateful to Jeanette Barbour, Danny Layne, Linea Nichols and John Schwarz for their assistance in the preparation of this manuscript.

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