An Experimental Examination of Labor Supply and Work Intensities

Abstract

Estimated negative substitution effects on work hours question the empirical validity of the classical labor supply model. Estimates are reconciled by allowing a dual choice of hours and effort for piecerate workers. In such a model, these negative substitution effects result from substituting on- and off-the-job leisure. We test our model using controlled experimentation on human subjects. These experiments, while not naturally occurring environments, represent real economic choices and can generate data unavailable elsewhere (e.g., effort data). The results support our model, and they have implications both for labor management and for empirical research focusing only on the hours choice. The classical static model of the labor-leisure choice offers positive compensated wage effects on hours of work as its main testable implication. Previous attempts to test this hypothesis with field data have cast doubt on the empirical validity of the static labor supply model due to the frequency of negative estimated compensated wage elasticities. A limitation of the model is that it views the choice of hours of work as the only