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...

Can public policy interfere with culture, such as beliefs and norms of cooperation? We investigate this question by evaluating the interactions between the State and the Civil Society, focusing on the labor market. International data shows a negative correlation between union density and the...

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...