Rational ignorance
Practice of avoiding research whose cost exceeds its benefits / From Wikipedia, the free encyclopedia
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Rational ignorance is refraining from acquiring knowledge when the supposed cost of educating oneself on an issue exceeds the expected potential benefit that the knowledge would provide.
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Ignorance about an issue is said to be "rational" when the cost of educating oneself about the issue sufficiently to make an informed decision can outweigh any potential benefit one could reasonably expect to gain from that decision, and so it would be irrational to waste time doing so. This has consequences for the quality of decisions made by large numbers of people, such as in general elections, where the probability of any one vote changing the outcome is very small.
The term is most often found in economics, particularly public choice theory, but also used in other disciplines which study rationality and choice, including philosophy (epistemology) and game theory.
The term was coined by Anthony Downs in An Economic Theory of Democracy.[1]