Abstract This article aims to provide an overview and discussion of the sources and effects of individual variation in how individuals make choices and decisions. This review encompasses both the micro and the life-span perspective, with the common assumption that individual differences are part of the evolved human design. Individuals reap the benefits of comparative advantage through differentiation, sustaining the survival of the species through complex social organization and their own reproductive fitness by occupying niches within it. Behavioural genetics research contains plentiful evidence for the existence of heritable differences in temperament and dispositions that will bear upon how we make decisions at the micro and life-space levels of choice.
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