This essay sets out a framework for evaluating empirical work in terms of the ability of the data to provide adequate parameter estimates and hypothesis tests about the true underlying structure. Problems of aggregation, representativeness and structural change are discussed in detail. These...

I argue for increased reliance on non-U.S. data and policy evaluations to understand basic labor- market parameters and to predict the effects of changes in U.S. labor-market policies. Foreign experiences generate exogenous shocks to labor costs that create unusual opportunities to measure...

I argue for increased reliance on non-U.S. data and policy evaluations to understand basic labor- market parameters and to predict the effects of changes in U.S. labor-market policies. Foreign experiences generate exogenous shocks to labor costs that create unusual opportunities to measure...

This essay sets out a framework for evaluating empirical work in terms of the ability of the data to provide adequate parameter estimates and hypothesis tests about the true underlying structure. Problems of aggregation, representativeness and structural change are discussed in detail. These...