Piketty’s Inequality Story in Six Charts

In this week’s magazine, I’ve got a lengthy piece about “Capital in the Twenty-first Century,” a new book about rising inequality by Thomas Piketty, a French economist, that is sparking a lot of comment and debate. (Brad DeLong has a useful summary of some early reviews.) I’ll go further into that discussion in future posts, but first I thought it might be useful to portray the gist of Piketty’s story in a series of charts.

The charts aren’t merely illustrative: they are an essential part of Piketty’s contribution. Fifteen or twenty years ago, debates about inequality tended to be cast in terms of clever but complicated statistics, such as the Gini coefficient and the Theil entropy index, which attempted to reduce the entire income distribution to a single number. One thing that Piketty and his colleagues Emmanuel Saez and Anthony Atkinson have done is to popularize the use of simple charts that are easier to understand. In particular, they present pictures showing the shares of over-all income and wealth taken by various groups over time, including the top decile of the income distribution and the top percentile (respectively, the top ten per cent and those we call “the one per cent”).

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