On the lack of association between taxes, GDP and happiness

During a February 6, 2016 debate, U.S. presidential aspirant Donald Trump claimed that: “Right now we’re the highest taxed country in the world.” Well, living in a country with much higher tax rates, I can tell you that his statement is patently false.1 But, really, who cares? That’s not just a snarky dismissal either. Who are the people most interested in low marginal tax rates? In Latin, they would say “cui bono?