Firms are more productive on average in larger cities. Two explanations have been offered: agglomeration economies (larger cities promote interactions that increase productivity) and firm selection (larger cities toughen competition allowing only the most productive to survive). To distinguish...

Spatial disparities in mortality can result from spatial di¤erences in patient characteristics, treatments, hospital characteristics, and local healthcare market structure. To distinguish between these explanatory factors, we estimate a flexible duration model on stays in hospital for a heart...

Ce rapport évalue l'impact du programme de zones franches urbaines mis en place en 1997 pour aider les chômeurs à trouver un emploi en faisant bénéficier les entreprises d'une baisse de charges sociales (environ un tiers des coûts salariaux totaux) si elles embauchent au moins 20% de leur...