"Readers of Charles Murray's book on libertarianism will recall the "trend line test." What you do is, quantify some social phenomenon — poverty, educational attainment, traffic accidents, infant mortality — and draw a graph of its incidence across several decades. Then, by staring hard at the graph, you try to spot where government intervention kicked in. Usually you can't."
https://www.johnderbyshire.com/Opinions/Culture/onliberty.html
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