hard to know what he can do about Mexico from Washington when the real source of the opiate problem might just be on Wall Street. You’re standing on the Rio Grande with a broom, he thinks, trying to sweep back the tide of heroin while billionaires are sending jobs overseas, closing factories and towns, killing hopes and dreams, inflicting pain. And then they tell you, stop the heroin epidemic. The difference between a hedge fund manager and a cartel boss? Wharton Business School.