How should we think about risk vs. uncertainty? A logical starting place is Frank Knight’s distinction: risk has an unknown outcome, but we know what the underlying outcome distribution looks like. Uncertainty also implies an unknown outcome, but we don’t know what the underlying distribution looks like. So games of chance like roulette or blackjack are risky, while the outcome of a war is uncertain. Knight said that objective probability is the basis for risk, while subjective probability underlies uncertainty.
To see another distinction between risk and uncertainty, we consult the dictionary: risk is “the possibility of suffering harm or loss.” Uncertainty is “the condition of being uncertain,” and uncertain is “not known or established.” So risk always includes the notion of loss, while something can be uncertain but might not include the chance of loss.
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