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. 2013 May 22;280(1759):20130247. doi: 10.1098/rspb.2013.0247

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© 2013 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 2. — Stealing rate across experimental conditions. Without a penalty (light grey bars), the overall rate is 87% and does not differ across treatments (, p = 0.315). With a penalty (medium and dark grey bars), the overall rate drops by 50 percentage points to 37% (H4a: , p < 0.001). The rate drops by 58 and 59 percentage points in the symmetric condition with a high penalty and the asymmetric condition with a low penalty, respectively—significantly more than in the symmetric condition with a low penalty, where it ‘only’ drops by 36 percentage points. The differences in differences are statistically significant (H4b: p = 0.018 and , p = 0.004, respectively).

Inline graphic — Stealing rate across experimental conditions. Without a penalty (light grey bars), the overall rate is 87% and does not differ across treatments (, p = 0.315). With a penalty (medium and dark grey bars), the overall rate drops by 50 percentage points to 37% (H4a: , p < 0.001). The rate drops by 58 and 59 percentage points in the symmetric condition with a high penalty and the asymmetric condition with a low penalty, respectively—significantly more than in the symmetric condition with a low penalty, where it ‘only’ drops by 36 percentage points. The differences in differences are statistically significant (H4b: p = 0.018 and , p = 0.004, respectively).