Superstition

An economic forecaster was known to have an horseshoe prominently displayed above the door frame of his office.

Asked what it was for, he replied that it was a good luck charm that helped his forecasts.

But do you believe in that superstition? he was asked, and he said, "Of course not!" But then why do you keep it? "Well," he said, "it works whether you believe in it or not."