This paper examines the different effects of two alternative selective incentives, punishment and reward, on cooperation in public goods experiments. Our experiments employ a stranger condition, in order to eliminate effects of reputation and direct reciprocity. We also provide a comparative analysis by varying the effectiveness of punishment(reward), that is the amount by which a punishment(reward) point reduces(increases) the recipient’s payoff. Results show that, (1)at the collective level, the opportunities to punish would improve the cooperation if the effectiveness of punishment exceeds a certain threshold, and average contributions increases along with the effectiveness. However, the opportunities to reward is ineffective in facilitating cooperation, which is independent of the effectiveness of reward; (2)at the individual level, the opportunities to punish(reward) fails to induce the punished(rewarded) subjects’ consequent contributions except when the effectiveness of punishment(reward) equals “2”(“4”); (3)the payoffs in the reward treatments show a significant higher level than that in the punishment treatments with peer effectiveness except when the effectiveness equals “1”. To sum, we find results roughly similar to that in partner conditions at the collective level, but distinctly different at the individual level.
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