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Supporting Information A: Statistical Analysis and Tables

Table A1: Random Effects Regression Analysis of Group Contributions in Experiment 1

Table A2: Percentage of observed allocations in delegation groups (Experiment 1)

Table A3: Probit and Random Effects Probit Analysis of Opt-In Decisions (Experiment 2)

Figure A1: Public Good Contributions and Opt-In Decisions over Time in Experiment 2

Figure A2: Frequency of Full Contribution Vectors by Treatment (Periods 6--20)

Supporting Information B: Experiment Instructions

ID Screen

General Information

Groups, Parts, Rounds, and Payoffs

Groups

Parts and Rounds

Payoffs

Description of Decision Task

Example Payoffs

Instructions Conclusion

Part II Instructions -- Voluntary contributions without communication

Part II Instructions -- Voluntary contributions with communication

Part II Instructions -- Voting without communication

Part II Instructions -- Voting with communication

Part II Instructions -- Endogenous delegation

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AJPS_531_sm_SuppMat.doc125KSupporting info item

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