The name is absent



Figure 3: Empirical distribution of average cooperation by economy(*)


(**)

Table 4: Cooperation in the first period of an economy

Number of
cooperative
actions

Private
monitoring

Anonymous
public monitoring

Private monitoring
with punishment

Public monitoring
(non-anonymous)

Average cooperation

73.5%

70.5%

84.5%

87.0%

Frequency of cooperation in an economy

4

36%

26%

50%

54%

3

30%

42%

38%

40%

2

28%

22%

12%

6%

1

4%

8%

0%

0%

0

2%

2%

0%

0%

Frequency of cooperation in a match

2

58%

51%

71%

75%

1

31%

39%

27%

24%

0

11%

10%

______2%______

_______1%______

(*) Kolmogorov-Smirnov two-tail two-sample test on distributions confirms results from the Mann-Whitney
tests on the differences between averages. On one hand private monitoring and anonymous public
monitoring are not statistically different (10% confidence level, n1=n2=50). Conversely, private monitoring
with punishment and non-anonymous public monitoring are not statistically different. Treatments from the
two groups are instead statistically different at least at a 5% level.

(**) In each treatment the number of observations is 50 for “average” and “frequency of cooperation in an
economy” and 100 for “frequency of cooperation in a match.”

19



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