This paper presents an impact evaluation of the French enterprise zone program which was initiated in 1997 to help unemployed workers find employment by granting a significant wage-tax exemption (about one third of total labor costs) to firms hiring at least 20% of their labor force locally....

This paper analyzes price and quantity-based approaches to management of airport congestion, using a model where airlines are asymmetric and internalize congestion. Under these circumstances, optimal congestion tolls are differentiated across carriers, and a uniformity requirement on airport...