Author of Capital in the Twenty-First Century, standard-bearer of inequality research
A French economist, the most influential scholar of wealth inequality today. He and his team gathered vast tax and wealth data spanning two or three centuries and many countries, and wrote the blockbuster Capital in the Twenty-First Century. He reached a core conclusion that sparked global debate: over the long run, the rate of return on capital (r) tends to exceed the growth rate of the economy (g) — "r > g" — meaning that getting rich by capital (property, investment) persistently outpaces getting rich by labor (wages), so wealth concentrates ever more in the hands of the already rich, and the gap widens. With solid data he pushed "inequality" back to the center of economics and public politics. Both the title and the conclusion clearly nod to Marx.
Piketty summed up his core finding in a terse inequality, "r > g": the return on capital long exceeds the growth of the economy. Put plainly, "money making money" outpaces "working for money" over the long run. This means that, left unchecked, a society’s wealth automatically and persistently concentrates in the few who already hold capital — inequality is not an accident but an inner tendency of capitalism. The conclusion made inequality a focus of global debate again.
Piketty’s "r > g" conclusion and policy proposals (such as a global wealth tax) drew fierce debate in academia and politics; this site states his views and the dispute.
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