Donald Trump has stiffed a lot of people over the years. His next, and largest, victim will probably be the U.S. government.COME APRIL, MILLIONS of Americans will pay taxes on income that buys less than it did a year ago. They’ll have watched gasoline climb from $2.94 to $4.29 a gallon and mortgage rates jump from 6.15% to 7.24%. Over the last five decades, Americans have hardly ever felt worse about the economy.But Donald Trump, who presided over all of it, is feeling quite flush.