"Depressive or anxiety-ridden kids can't compete effectively against their peers. A tendency to low mood, and the spectrum of subordinate behaviour with which depression is associated, may have been genetically adaptive for low-status tribal weaklings on the African savannah. For depressive behaviour, contingently activated, can be a viable fallback strategy for stressed low-status tribal animals in an adverse social environment. This may explain why depressive disorders are so common. But a genetic predisposition to low spirits, or at least anything like unipolar depression as distinct from bipolarity, is not part of an optimal reproductive strategy for potential "winners". If intelligently engineered, a genetically enhanced sense of well-being is empowering. Its behavioural phenotypes are potentially far more adaptive than the predisposition to learned helplessness and behavioural despair characteristic of the depressive spectrum. So in the new reproductive era, pushy parents in particular are likely to shun depressive genotypes."