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Opinion | The Billionaires Are Getting Nervous - The New York Times

When Bill Gates founded Microsoft in 1975, the top marginal tax rate on personal income was 70 percent, tax rates on capital gains and corporate income were significantly higher than at present, and the estate tax was a much more formidable levy. None of that dissuaded Mr. Gates from pouring himself into his business, nor discouraged his investors from pouring in their money.