1. Huffman (1973a, b, 1977b, 1980), in his seminal work on off-farm labor supply of farm operators, used county-level data from three different states (Iowa, Oklahoma, and North Carolina). He acknowledged some aggregation bias might exist, but Sexton (1975) showed this bias may not be very significant.
2. Allocative Efficiency: The Role of Human Capital
3. Ahearn M. (1986). “Financial Well-Being of Farm Operators and Their Households.” AE Report No. 563, Economic Research Service/U.S. Department of Agriculture, Washington, DC.
4. Regional Differences in the Contribution of Off-Farm Work to Income Inequality