I recall Robert Heinlein poking at this question in his book "The Moon is a Harsh Mistress"; the inhabitants of its hardscrabble lunar mining colony have no hea

I recall Robert Heinlein poking at this question in his book "The Moon is a Harsh Mistress"; the inhabitants of its hardscrabble lunar mining colony have no health insurance system, but they certainly do have bookies, so they place bets against their own ill-health as a means of covering medical costs.