What made this collapse so remarkable is that it was not caused by some external factor, but originated within the financial system itself and spread from there throughout the global economy. This was almost completely unexpected, as the prevailing view was that financial markets are self-correcting.
问题之所以如此严重，原因是本次事件的起因不是由外部因素，而恰恰是由金融系统的内部引发的，由此不断蔓延，最终导致全球的经济危机。原先大家都认为金融市场具有自我修正的能力，没想到事情来得如此突然。