Concerned that inflation is much too high, the U.S. Federal Reserve increased interest rates by half a percentage point this week.

It was a bold move, but one that had been signaled well in advance and was bounded by Fed Chairman Jerome Powell¡¯s comments that even larger increases were not being considered. Nevertheless, markets plunged sharply around the world.

That fall is a vote of no confidence in the Fed¡¯s ability to safely navigate between competing imperatives: controlling inflation and keeping the economy growing. History suggests that skepticism is in order given the enormity of the challenge and the narrow margin of error.