US super-rich call for wealth tax

Some of America's richest people are urging US presidential candidates to back a wealth tax on the super-rich to improve inequality and climate change. "America has a moral, ethical and economic responsibility to tax our wealth more," they said in a letter. Signatories include investor George Soros, Facebook's co-founder Chris Hughes, and Molly Munger, daughter of billionaire Charlie Munger.
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