As research on the dark triad (DT; the interrelated constructs of Machiavellianism, narcissism, and psychopathy) has accumulated, a subset of this research has focused on explicating what traits may account for the overlap among the DT members. Various candidate traits have been investigated, with evidence supporting several of them, including antagonism (vs. agreeableness), honesty-humility, and callousness and interpersonal manipulation (the latter 2 as a set). The present study sought to test the leading candidates against one another in their ability to account for the shared variance among the DT members. Using a preregistered analytical plan, we found that agreeableness (as measured by the International Personality Item Pool-NEO-120), honesty-humility (H/H) from the HEXACO-Personality Inventory, and the Self-Report Psychopathy Scale subscales of Callous Affect and Interpersonal Manipulation accounted for all or nearly all of the shared variance among the DT members. Big Five Inventory (BFI)-based measures of Agreeableness (BFI and BFI-2) accounted for notably less variance in most cases. The results were consistent across 2 large samples (Ns of 627 and 628) and across various DT measurement approaches. We argue that the most parsimonious explanation for findings on the core of the DT is that such traits all fall under the umbrella of antagonism. (PsycINFO Database Record (c) 2020 APA, all rights reserved).
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