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NEW YORK: America's billionaires have seen their wealth rise by more than $1 trillion since the start of the coronavirus pandemic, according to a study Wednesday, fueling a debate about higher taxes on the rich. The collective wealth of the 651 billionaires in the United States soared from $2.95 trillion on March 18 to $4.01 trillion on Monday, said the Institute for Policy Studies and Americans for Tax Fairness (ATF).