As the cultural evolution of a puritanical moral norm in Turkey illustrates, puritanical moral norms are not developed by nonrational reasoning concerned with purity and cleanliness. People use puritanical moral rules as moral heuristics for making intendedly rational decisions about whether to cooperate or not when the commitment of the counterparty is uncertain.
View Article and Find Full Text PDFHeuristics (shortcut solution rules) can help adaptation to uncertainty by leading to sufficiently accurate decisions with little information. However, heuristics would fail under extreme uncertainty where information is so scarce that any heuristic would be highly misleading for accuracy-seeking. Thus, under very high levels of uncertainty, decision-makers rely on heuristics to no avail.
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