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Billionaires have become central to the Democratic primary race — thanks to both their donations and their taxes.
A wealth tax, like the ones proposed by presidential candidates Sen. Elizabeth Warren and Sen. Bernie Sanders, would make ultra-wealthy Americans pay the federal government a small percentage of their net worth each year.
Former New York City Mayor Mike Bloomberg proposed a 'surtax' on ultra-wealthy Americans' income that would leave their net worth alone and...
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