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Capital in the Twenty-First Century

Thomas Piketty

Egalitarian political economy

The most influential economics book of its generation. Marshalling centuries of data, Piketty argues that when the return on capital outpaces economic growth (r > g), wealth concentrates in the hands of those who already own it, pushing modern societies back toward the inherited inequality of the nineteenth century. A landmark empirical case that inequality is a structural tendency of capitalism, not an accident.

About the author

French economist (b. 1971), professor at the Paris School of Economics, known for pioneering the long-run empirical study of income and wealth inequality. Capital in the Twenty-First Century became a surprise global bestseller and made him one of the most influential and debated economists of the era.

Synopsis

Drawing on tax and wealth records from many countries over two centuries, Piketty documents a long-run tendency for capital to grow faster than output, so that accumulated and inherited wealth claims an ever-larger share unless interrupted by war, depression, or deliberate policy. He proposes progressive taxes on income and a coordinated tax on wealth to keep inequality compatible with democracy.

Core passage idea

Paraphrase · Modern copyrighted work

Piketty argues that when the rate of return on capital exceeds the rate of economic growth, inherited wealth grows faster than earned income — driving a structural rise in inequality that markets alone will not correct.

The famous inequality r > g turns a moral worry into an empirical claim: left alone, capitalism tends to concentrate wealth and entrench inheritance. Whether the data support the law and whether his global wealth tax is feasible are the debates the book set off worldwide.

To avoid a bubble

Pair with market economists who dispute the r > g mechanism, question Piketty's data and his proposed global wealth tax, and argue that mobility, innovation, and rising living standards matter more than the distribution of capital.

Reading note

Long and data-rich, but the core argument is graspable from the introduction and conclusion. Pair it with its market-economist critics to weigh both the evidence and the politics of the remedy.

Best paired with

Karl Marx, Capital; Friedrich Hayek, The Road to Serfdom.

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