Introduction - The public sector look of american unionism - Richard B. Freeman and Casey Ichniowski I - The role of public sector labor law 1 - Public sector union growth and bargaining laws: a proportional hazerds approach with time-varying treatments - Casey Icniowski / Comment - John M. Abowd 2 - Public sector bargaining laws really matter: evidence from Ohio and Illinois - Gregory M. Saltzman / Comment - William T. Dickens 3 - The effects of public sector labor laws on labor market institutions and outcomes - Richard B. Freeman and Robert G. Valleta / Comment - Harvey S. Rosen 4 - Arbitrator behavior in public sector wage disputes - Dave E. Bloom / Comment - Morris A. Horowitz 5 - The evolution of public sector bargaining laws - Henry S. Farber II - The effects of public sector bargaining on wages 6 - Union/nonunion wage gaps in the public sector - H. Gregg Lewis / Comment - Zvi Griliches 7 - Employer size, pay and the ability to pay in the public sector - Charles C. Brown and James L. Medoff / Comment - Daniel S. Hamermesh 8 - Are public sector workers paid more than their alternative wage? evidence from longitudinal data and Job Queues - Alan B. Krueger / Comment - Lisa M. Lynch III - Effects on nonwage outcomes 9 - on estimating the effects of increased aid to education - Ronald G Ehrenberg and Richard P Chaykowski / Comment - Richard J. Murnane 10 - Unions and job security in the public sector - Steven G. Allen / Comment - Joseph G. Altonji 11 - Unionism and licensing of public school teachers: impact on wages and educational output - Morris M. Kleiner and Daniel L. Petree / Comment - Randall W. Eberts and Joe A. Stone 12 - The effects of public sector unionism on pay, employment, department budgets and municipal expenditures - Jeffrey Zax and Casey Ichniowski / Comment - Harry J. Holzer Appendix A - Collective organization of labor in the public sector - Richard B. Freeman, Casey Ichniowski and Jeffrey Zax Appendix B - The NBER public sector collective bargaining law data set - Robert G. Valletta and Richard B. Freeman