Can anything stop America’s superstar hedge funds?

Ken Griffin was stunned. It was March 10th and America’s markets had suddenly fallen out of love with Donald Trump. The NASDAQ index fell by 4%. Citadel, Mr Griffin’s hedge fund, had lost money in the rout. “You have to tear apart and re-examine the portfolio,” he told The Economist after markets closed. “And ask yourself in what ways we have positioned or mispositioned ourselves against the reality that the odds of a recession have gone higher.”