When the cat's away, some mice will play: A basic trait account of dishonest behavior

In line with every-day observation, research has established substantial individual differences in ethical behavior, especially dishonesty and cheating. However, these individual differences have remained mostly unexplained, especially in terms of traits as specified in models of basic personality structure. Theoretically, a prime candidate to account for these differences is the Honesty-Humility factor proposed as the sixth basic personality dimension within the HEXACO Model of Personality. Despite clear theoretical links, corresponding behavioral evidence is scarce and limited due to methodological caveats. In a series of six behavioral experiments we thus bridge the gap between behavioral ethics and personality research - critically testing whether individual differences in dishonest behavior can be accounted for by basic traits in general, and Honesty-Humility in particular. We implement different cheating paradigms, tasks, incentive structures, samples, and sets of covariates to evaluate the robustness and generality of results. Overall, variance in dishonest behavior was indeed accounted for by Honesty-Humility which was the only consistent predictor of cheating across the various experimental setups and beyond relevant covariates including other personality factors. The results thus corroborate that individual differences in ethical behavior can be accommodated by comprehensive models of personality structure in general and the Honesty-Humility factor in particular.