There is a wonderfully dark metric used by, among others, transport safety experts: CPF, that is Cost of Preventing a Fatality. When investing in a safety system, the decision will often come down to whether the cost of the system per life saved stays below a budget. Remember that if the driver of your train or pilot of your plane looks a bit sleepy. Bizzare as such measures sound, we make similar judgements about risk on our and others behalf all the time. For ourselves this might be no-one e....
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