Greg Mankiw Forgot What He Teaches

By James Kwak

I’ve written severaltimes about what I call the Economics 101 ideology: the overuse of a few simplified concepts from an introductory course to make sweeping policy recommendations (while branding any opponents as ignorant simpletons). The most common way that first-year economics is misused in the public sphere is ignoring assumptions. For example, most arguments for financial deregulation are ultimately based on the idea that transactions between rational actors with perfect information are always good for both sides — and most of the people making those arguments have forgotten that people are not rational and do not have perfect information.

Mark Buchanan and Noah Smith have both called out Greg Mankiw for a different and more pernicious way of misusing first-year economics: simply ignoring what it teaches — or, in this case, what Mankiw himself teaches. At issue is Mankiw’s Times column claiming that all economists agree on the overall benefits…