The true test of an analytical framework is how it performs in unusual or extreme circumstances, how well it predicts “out of sample”. What we have experienced since 2007 is a series of huge policy shocks — and basic macroeconomics made some very counterintuitive predictions about the effects of those shocks. Unprecedented budget deficits, the model said, would not drive up interest rates. A tripling of the monetary base would not cause runaway inflation. Sharp government spending cuts wouldn’t free up resources for the private sector, they would depress the economy more than one-for-one, so that private spending as well as public would fall.
Quite a few people considered these predictions not just wrong but absurd; they braced for soaring rates and inflation, they waited for the good news from austerity. But the model passed the test with flying colors. Remember how Romer and Bernstein were savaged for assuming a multiplier of around 1.5? Four years later, after much soul-searching from the IMF about why it underestimated the costs of austerity, estimates seem to be converging on a multiplier of … about 1.5.
Liberal orthodoxy should quit be shy, and simply stand up, and say, "You were wrong, we were right, and we told you so all along."
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