President Franklin D. Roosevelt's closest adviser and architect of the New Deal, Harry Hopkins, advised, "Tax and tax, spend and spend, elect and elect, because the people are too damn dumb to know the difference." Professor Bryan Caplan, my colleague at George Mason University, sheds some light on Hopkins' observation in his new book, "The Myth of the Rational Voter: Why Democracies Choose Bad Policies."

Caplan is far more generous than Hopkins. Instead, he says pe ...

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