Personal trust increases cooperation beyond general trust.

On the other hand, the results of cooperation in the iterated prisoner's dilemma for each group separately exhibited non-significant differences in the TC by means ofPearson Chi-square tests: mutuality (X2(1, n = 54) = 0.84, p<0.4); cooperation in the three decisions (X2(1, n = 54) = 1.20, p<0.3); total of cooperative decisions (X2(1, n = 54) = 1.38, p<0.3); cooperation in the first decision (X2(1, n = 54) = 1.92, p<0.2); cooperation in the third decision (X2(1, n = 54) = 0.991, p<0.4); and barely significant differences in some measures of cooperation in the NTC, such as cooperation in the three decisions (X2(1, n = 54) = 5.129, p<0.03); and total of cooperative decisions (X2(1, n = 54) = 5.84, p<0.02).

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One-tailed McNemar tests demonstrated that there was a significant higher proportion of cooperation for each of the dependent variables in the TC than in the NTC, except as regards the first decision, whose differences failed to reach significance.

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The highly significant differences found in cooperation between the two experimental conditions –trust and non-trust circle conditions– clearly show that personal trust increases cooperation beyond the baseline level commonly found even in one-shot anonymously played games.

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