1. Department of EconomicsGeorge Mason UniversityMSN 3G4FairfaxVA22030USA
2. Department of EconomicsBeloit CollegeCampbell Hall, 700 College StreetBeloitWI53511USA
3. School of Public Policy, Planning, and DevelopmentUniversity of Southern CaliforniaLos AngelesCA90089‐0626USA
4. Department of Economics, Purchase CollegeState University of New York735 Anderson Hill RoadPurchaseNY10577USA
5. Department of EconomicsWest Virginia UniversityMorgantownWV26506‐6025USA