The authors hypothesize that the effectiveness of external threats in raising workers' effort is mediated by, among other labor market conditions, the presence or absence of a powerful union. In particular, they argue that because powerful unions reduce the potency of the external threat of job...

Social surveys are often used to estimate unemployment duration distributions. Survey nonresponse may then cause a bias. We study this using a unique dataset that combines survey information of individual workers with administrative records of the same workers. The latter provide information on...