A matching model, combined with a shirking model of efficiency wages, is examined. It depends on sources of unemployment variation whether the no-shirking condition (NSC) tends to be binding as the unemployment rate is lower. When only productivity varies, the NSC tends to be binding as the...

A matching model, combined with a shirking model of efficiency wages, is examined. It depends on sources of unemployment variation whether the no-shirking condition (NSC) tends to be binding as the unemployment rate is lower. When only productivity varies, the NSC tends to be binding as the...