The problem is that asset prices and consumer-price inflation may move in different directions, as they did in the 2000’s, and that weighing both factors would produce inconsistent policy recommendations. As a result, central banks ran the risk of no longer appearing to follow a clearly formulated policy guideline.
上述欧洲观点的困难在于，资产价格和消费者价格通胀可能会向不同的方向运动，就像21世纪头十年那样，所以同时考量两种因素会导致政策上的自相矛盾。这将致使央行面临丧失明确政策指导方针的风险。央行的公信力在于简单明了的法则，法则亡则公信力亡。