The last paragraph people keep mentioning:
> "But Keynes’s famous paradox of thrift still holds: Six years after the crash, the American economy could use more consumer spending, especially among those who can afford it. Growth has picked up this year in part because Americans have started to open their wallets, and retailers anticipate a frenzied holiday season. Were we to suddenly start living like Mr. Money Mustache suggests, the implications for the economy would be dire; were we to start spending like we did in the 1990s, things would feel great. Mustachism may save us from our worst excesses, but saving, ultimately, isn’t the only point. A better economy requires more income growth, not just more personal thrift."
This is a statement about economic theory, which is notoriously imprecise and contradictory to other economic theory.
If we all started living more according to our values, the businesses that responded would flourish. Those that didn't wouldn't. There would probably be less pollution, healthier diets, more happiness, and less craving. Economists would go back to the drawing boards and figure out how to explain that supplying the necessities of life turns out not to require everything we're doing now. They've been wrong before, they'll be wrong again, and many of them are wrong now.