We present a simple dynamic model of contributions to a public good. We test the model by conducting a public good game experiment and fundraising experiment among religious Jewish students for the procurement of sustainable supplies for their campus synagogue. The results of the experiments show a high level of cooperation; particularly, the results of the public good experiment show that contributions are above the predicted optimum. Nevertheless, in accordance with the economic theory, we find that the contribution path is upward sloping and contributions increase with the benefit of the public good. Our findings also suggest that the level of contributions and their path are affected by peer and gender effects.
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