| | I'm reminded of Frank Knight's own work on the two kinds of risk that exist in economics; insurable and uninsurable risks. Insurable risks are those which have regularity and certainty that can be found like the probabilities of certain kinds of weather within a short span of time. Uninsurable risks are those which could be considered acts of Nature beyond current understanding (like volcanism, earthquakes, and etc). If one considers health insurance, then one realizes that what it covers isn't the uninsurable, or more commonly called disastrous misfortune. Health insurance covers purely those risks that are well known among a population, that's why one never assumes a pre-existent condition like diabetes or astigmatism as these can be considered per a population (in terms of age, sex, ethnicity, geography, work-ethic, and many other vectors to correlation upon). Thus, these pre-existent conditions can be insured against per their risks.
The problem is that individuals may be good at considering their own risks, but when an agency like the State comes into the picture, it can act as a means to screen out significant factors in terms of the calculation of those given risks. Whether by subsidy or outright omission of certain kinds of information, the calculation by individuals gets skewed in favor of further intervention (thus further restriction of economic calculation of insurable risks, which makes it easier for uninsurable risks to sneak into the costs of health insurance or other similar insurances).
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