Just ask people who owned luxury condos in Tokyo after 1990, or investors in Cisco Systems (CSCO) after the tech-stock bubble popped.

• 只要问问那些1990年后在东京拥有豪华公寓的人，或在科技类股泡沫破裂之后持有思科系统(CiscoSystems)股票的投资者就知道了。