Fig. 4: The effect of sanctions.
From: Economic experiments support Ostrom’s polycentric approach to mitigating climate change
a Regression of sanctions received by subgroups of 3 players on the total contribution of subgroup. Bigger dots indicate overlay. b Sanctions received per subgroup whose total contribution ranks either high, medium or low within its group. c Mean contribution by sanctioned subgroup in round before and after sanctioning by one or two subgroups, respectively. Bars indicate standard errors. Stippled line indicates the fair contribution per subgroup. d Contribution per player that had contributed €2 when the subgroup was sanctioned because another player had contributed €0, during rounds after the sanctioning was received (T3, pink); only first instance of sanctioning per subgroup analysed. The same analysis carried out in the treatment for the first occurring triplet of €0, €2, €2 contributions (T4, blue). Bars indicate standard errors. Stippled line indicates fair share per player. e Regression of sanctioned players with the lowest contribution rank in a subgroup received during the first 5 rounds on their additional contributions during the last 5 rounds of the experiment. f Regression of sanctioned players with the highest contribution rank in a subgroup received during the first 5 rounds on their additional contributions during the last 5 rounds of the experiment. See text for statist.
