Piketty's Three Big Mistakes

Thomas Piketty's theory about income inequality has taken a triple hit from an MIT graduate student.

A critique that lands.

Photographer: Toshifumi Kitamura/AFP/Getty Images

Matt Rognlie is a fun guy and a very smart guy. An economics doctoral student at Massachusetts Institute of Technology, Rognlie had a blog, but ditched it in favor of writing long comments and e-mails to bloggers (including yours truly). As proof that blogs can be an important part of the research process, Rognlie turned a blog comment into the most biting critique of Thomas Piketty yet produced. 

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