"Yes, billionaires will have to pay a little more," Senator Elizabeth Warren said of the revised tax package she introduced recently, "six cents on each dollar."

This modest-sounding proposal, though, would have a far-reaching impact on the wealthiest Americans when combined with her other tax plans — shrinking colossal fortunes over time and making it much more difficult to hand down multibillion-dollar legacies.

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Premium - NZ's super-rich and the tax man: 350 people. Each worth $50m plus. And

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