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"That paper, titled "How Useful Is the Theory of Disruptive Innovation?," does not take up a more far-reaching question: Why has a mostly untested theory persisted and proliferated for 20 years? "

""I think most faculty regard grades as a nuisance," he says. But if professors didn't give them, "students probably wouldn't work as much and wouldn't do homework and wouldn't study for exams," he argues."

"In their writings, Buchanan and other libertarian thinkers lay out a vision for a certain kind of society. It's a society where capitalism has free rein and the rights of the wealthy few are protected, while the many are prevented from exercising countervailing power. It's a society where government is so shrunken as to be unrecognizable. In the country they envision, most protections that benefit average Americans have vanished: Social Security has been abolished, worker and public-health protections are gone, and public schools are shuttered in favor of private education. It's a country where national parks and water supplies are sold to the highest bidder. That's not a country most Americans would recognize. And it's not a country most of us, from any political party, would want to inhabit. "