GRIPS 政策研究センター Policy Research Center


Jan 11, 2012 Report No:11-17

On the behavioural relevance of optional and mandatory impure public goods: results from a laboratory experiment

  • Dirk EngelmannUniversity of Mannheim
  • Alistair Munro GRIPS
  • Marieta ValenteUniversity of Minho
Field Economics
Language English

Ethical goods are increasingly available in markets for conventional goods giving pro-ethically motivated consumers a convenient option to contribute to public goods. In a previous experiment we explored the behavioural relevance of impure public goods in a within-subject setting and observed reduced aggregate pro-social behavior in the presence of impure goods that favor private consumption at the expense of public good provision.
In this experiment, we implement a between-subject design to test the behavioural relevance of impure public goods with only a token contribution to a public good cause. From a theoretical perspective, assuming people demand private and public characteristics regardless of how they are provided, we would expect no behavioural relevance of the presence of impure public goods. However, this experiment establishes that pro-social behaviour defined as contributing to a public good, is negatively affected by impure goods with token contributions, in comparison to when they are absent. Furthermore, if the token impure good is mandatory instead of optional the negative effect on pro-social behaviour seems to be offset. The results from this experiment suggest impure public goods are not behaviourally irrelevant, can decrease pro-social behaviour but their optional or mandatory nature can have different behavioural consequences.

Keywords Experimental Economics, impure public goods, ethical goods, pro-social behaviour, social norms, experimental dictator games
attachment 11-17.pdf