A rising tide lifts all boats — not!

John Emerson on why Thomas Piketty “strikes at the heart of liberal Democrats’ first principle of political economy”:

Piketty’s “r>g” formula denies specifically this point. And not only did he disprove the liberal economists’ fundamental principle, he did it using the tools of liberal economics. For forty years or so American workers’ incomes have been stagnant or declining, and as the years have gone by this tendency has intensified. But there has been no theoretical explanation for these very evident facts, and without a theoretical explanation liberal economists felt that their hands were tied; these were things that everybody knew, but no one knew it in a proper scientific way.

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