Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This article analyzes the relationship between hours of work and labor force participation in J. J. Heckman's model, J. F. Cogan's fixed-cost model, R. Moffitt's minimum hours constraint model, and a generalized version of Heckman's model. First, the parameter restrictions between the labor force participation and reduced-form hours-of-work equations are compared. The models are then estimated and the results support the weakening of the link between the labor force participation and hours-of-work decisions. One implication of the analysis is that Heckman's model overstates the standard labor supply elasticities because it confounds the direct effect on labor supply with the participation effect. Copyright 1993 by University of Chicago Press.