The notion that policies designed to change the economy’s course should be done slowly, instead of all at once. The phrase is attributed to Nobel laureate Milton Friedman, who likened a central bank that acted too forcefully to a fool in the shower. When the fool realizes that the water is too cold, he turns on the hot water. However, the hot water takes a while to arrive, so the fool simply turns the hot water up all the way, eventually scalding himself.