Humans have been honed over millions of years of evolution to respond to certain situations without thinking too hard. If your ancestors spotted movement in the undergrowth, they would run first and grunt questions later. At the same time, the capacity to analyse and to plan is part of what distinguishes people from other animals. The question of when to trust your gut and when to test your assumptions—whether to think fast or slow, in the language of Daniel Kahneman, a psychologist—matters in the office as much as in the savannah.
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