What happens when a firm switches from paying hourly wages to paying piece rates? The theory developed below predicts that average productivity rises, that the firm will attract a more able work force and that the variance in output across individuals at the firm will rise as well. The theory is...

Churn, defined as replacing departing workers with new ones as workers move to more productive uses, is an important feature of labor dynamics. The majority of hiring and separation reflects churn rather than hiring for expansion or separation for contraction. Using the JOLTS data, we show that...