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Knightian uncertainty
In economics, Knightian uncertainty is risk that is immeasurable, not possible to calculate.
Knightian uncertainty is named after University of Chicago economist Frank Knight (1885–1972), who distinguished risk and uncertainty in his work ''Risk, Uncertainty, and Profit:''〔Knight, F. H. (1921) (Risk, Uncertainty, and Profit ). Boston, MA: Hart, Schaffner & Marx; Houghton Mifflin Company〕
:"Uncertainty must be taken in a sense radically distinct from the familiar notion of Risk, from which it has never been properly separated.... The essential fact is that 'risk' means in some cases a quantity susceptible of measurement, while at other times it is something distinctly not of this character; and there are far-reaching and crucial differences in the bearings of the phenomena depending on which of the two is really present and operating.... It will appear that a measurable uncertainty, or 'risk' proper, as we shall use the term, is so far different from an unmeasurable one that it is not in effect an uncertainty at all."
== Related concepts ==
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