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The '''variability hypothesis''', aka the '''greater male variability hypothesis''' states that males experience greater variability in traits than females. This includes more [[Bateman's principle|variability in sexual preferences]],<ref></ref> social attitudes, behaviours, intelligence, strength, other physical traits, genetic variation (though this is contested, see [[mutation]]), etc., the only exception being fear and emotionality, in which women show greater variability.<ref>Hyde, Janet Shibley. "Gender Similarities and Differences." The Annual Review of Psychology. 2014. 65:3.1–3.26 doi: 10.1146/annurev-psych-010213-115057.</ref>
Higher male variability may only concern dimensions in which men outcompete women as everything tends to get more varied the more potential there is.{{citation needed}} Men are simply more potent than women in many regards (taller, stronger, smarter, etc.), so overall men tend to have more variability. Conversely, women may have greater variability in dimensions they outcompete menhave a higher mean (e.g. fear and emotionality). [[Metthew effect]]s may also play a role as men are more expected to succeed and more responsible for their lives, i.e. men may experience more of a downward spiral when they loose and more of an upward spiral when they succeed.
==History of the hypothesis==


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