Still, when considered as a percentage of income, even the big sums paid by some billionaires are way lower than the tax rates many teachers, accountants, and plumbers pay every year. If Musk, currently worth an estimated $716 billion, had to pay a 5 percent wealth tax, he’d probably manage to scrape by with a $680 billion nest egg—enough to buy Ford, General Motors, Toyota, and Mercedes, and still remain the world’s richest person. (In any case, he’s safe from California taxes; a few years ago he moved to Texas.)