The US seems to finally have decided that inequality is a problem. The reassurance that a rising tide would lift all boats rings hollow after a series of recessions left so many stuck in the mud. Economists are realising that allowing greater inequality often doesn’t boost growth. And the moral case for inequality — the notion that rich people are fairly compensated for creating huge amounts of economic value — also seems to have largely collapsed. Even some Republicans are now talking about the problem.

But the difficult and interrelated questions of why inequality has increased, and what to do about it, remain largely unanswered. The loudest voices on the issue tend to emphasise the upper tail of the distribution — the vast fortunes of Jeff Bezos, Mark Zuckerberg or Elon Musk. Even before the recent surge in stock valuations, a small sliver of Americans was controlling a noticeably larger share of the nation’s wealth...

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