The Experimetrics of Public Goods: Inferring Motivations from Contributions |
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Authors: | Nicholas Bardsley Peter G. Moffatt |
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Affiliation: | (1) National Centre for Research Methods, University of Southampton, Southampton, S017 1BJ, UK;(2) School of Economics, University of East Anglia, Norwich, NR4 7TJ, UK |
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Abstract: | In public goods experiments, stochastic choice, censoring and motivational heterogeneity give scope for disagreement over the extent of unselfishness, and whether it is reciprocal or altruistic. We show that these problems can be addressed econometrically, by estimating a finite mixture model to isolate types, incorporating double censoring and a tremble term. Most subjects act selfishly, but a substantial proportion are reciprocal with altruism playing only a marginal role. Isolating reciprocators enables a test of Sugden’s model of voluntary contributions. We estimate that reciprocators display a self-serving bias relative to the model. |
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Keywords: | altruism finite mixture models reciprocity tobit trembles voluntary contributions |
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