It is not entirely clear why the alarms are sounding just now, after five years of general expansion in markets since they hit bottom in early 2009. Why aren’t people blithely expecting more years of expansion?
为何这些警报到现在才拉响并不完全明白，因为自2009年初触底以来，市场已经经历了五年的整体扩张。为何人们不再乐观地预期还有多年的扩张？