An experimental examination of labor supply and work intensities

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 piece-rate 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.