摘要：Fischbacher and Gaechter (AER, 2010) find that contributions decline in repeatedly played public good games because people are imperfect conditional cooperators who match others' contributions only partly. We re-examine the data using dynamic panel data methods and find that contributions also decline because people only partially match their own contributions from previous periods. We discuss possible interpretations.
关键词：Public Goods; Conditional Cooperation; Dynamic Panel Data Methods
