John Maynard Keynes, a truly brilliant man, and an entertaining one with wide cultural interests, made wonderfully entertaining arguments for doing the wrong thing, many of them ingeniously counter-intuitive. "Public economists" (on the analogy of "public intellectuals") such as John Kenneth Galbraith in the last generation, and Paul Krugman in this, stand in direct succession to him: same attitudes, same habits.If an economic theory is designed merely as a means to support policy decisions, there is sure to be hell to pay when the implications of those decisions are played out.
Lord Keynes' great rival, Friedrich Hayek, exploded many of the economic fallacies upon which Keynes depended, along with many of the facts which Keynes massaged to fit his own passing needs. But Hayek's strongest criticism is too lightly passed over. He said that Keynes was interested in economic theory only as a means to influence current policy.
Read Warren's whole piece here.