This paper addresses the design of empirical tests to distinguish between two competing explanations of wage and employment determination in unionized labour markets, the labour-demand and efficient-contract models. We argue that most of the tests employed are restrictive, propose an alternative...

This paper addresses the design of empirical tests to distinguish between two competing explanations of wage and employment determination in unionized labour markets, the labour- demand and efficient-contract models. We argue that most of the tests employed are restrictive, propose an...