When times are good they will struggle to take the punchbowl away: a central bank that tried to stop subprime lending in 2003 would have faced a political firestorm.

• 形势好的时候，中央银行可以挣扎着解除一些衰退危机：如果央行在2003年停止发放次级贷款，那么它们也许就会面临一场政治风暴。