An Economist Answers Some of My Questions About “Capital in the 21st Century”


On Thursday I posted a couple of very rudimentary comments regarding Thomas Piketty’s blockbuster new book, Capital in the 21st Century. I had questions about Piketty’s estimates of r (return on capital) and g (economic growth) in the past and—much more importantly—how they were likely to play out in the future. But all I had were amateur musings because I am, after all, only an amateur.

However, yesterday Brad DeLong tackled some of the questions I asked in a far more rigorous and disciplined way, teasing out a lot of unstated implications along the way—including the importance of various measures of r and how they relate to the probability of increasing future wealth concentration in the real world. It’s a long post, and complex in places, but highly recommended. If you’re willing to work your way through it, DeLong provides a framework for thinking about Piketty’s model that helps you start to make sense of both the book and its conclusions.

POSTSCRIPT: I’ve gotten a couple of questions about why I seem unduly skeptical, or even harsh, about Piketty’s book. It’s obviously a landmark work, I don’t really mean to be unfair. But it’s a book with innovative and untested ideas that has obvious appeal to anyone left of center, and I think this is precisely the time to avoid unquestioning hosannas. Affinity bias makes us all sympathetic to Piketty’s arguments, and that’s why we should instead question it carefully and thoroughly.

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Which is also a pretty great way to describe Mother Jones' mission: People coming together around the truth to hold power accountable.

And right now, we need to raise about $400,000 from our online readers over the next two months to hit our annual goal and make good on that mission. Read more about the information war we find ourselves in and how people-powered, independent reporting can and must rise to the challenge—and please support our team's truth-telling journalism with a donation if you can right now.

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