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求助-一句话的理解,经济方面的,,谢谢~ [Copy link] 中文

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Post time 2007-8-26 17:28:59 |Display all floors
In theory, ratings agencies and mathematical models help investors price the risk they are taking on,
even if the securities they are buying are scarcely traded. Yet when some supposedly good-quality assets
proved to be worth little, people lost faith in the models and the ratings. Across the board, investors had
failed to take account of how fast and how far asset prices fall when everyone wants to sell at the same
time. Hard-to-sell long-term securities had been bought with short-lived debt, which left borrowers
vulnerable to a change in sentiment every time the debt fell due.
It does nothing to restore confidence
when the biggest model-driven hedge funds had to get in new money. The people at Goldman Sachs lost
a packet when something happened that their computers told them should occur only once every 100
millennia.
请教红色部分这一句如何理解。。 a change in sentiment指的是什么呢? 带有短期债务的长期债券是什么?困惑ing~~~谢谢!!!

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