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This article formulates and estimates alternative equilibrium models of industrial wage determination and self-selection. In explaining industrial wage differentials, we find that it is important to account for heterogeneous sector-specific skills and self-selection decisions by agents concerning their sector of employment. The classical Roy model is rejected. So is an efficiency units model of the labor market. A revised Roy model that accounts for comparative advantage in the choice of industrial sectors and choice between market and nonmarket work is much more successful in explaining cross-section wage distributions and their evolution over time.
Heckman et al. (Mon,) studied this question.