Legislation introduced on Monday would impose a 5 percent annual wealth tax on America's billionaires, generating a hefty payment for millions of families if passed. The Make Billionaires Pay Their Fair Share Act, unveiled by Senator Bernie Sanders, a Vermont independent, and Representative Ro Khanna, a California Democrat, would raise an estimated $4.4 trillion in revenue over the next decade if signed into law. The proposal would fund extensive social spending programs, including a $3,000