迄今为止，观察过次级抵押贷款者还款规律的经济学家都指出，当房产价格达到顶峰并开始下滑时，并不是所有的次级借贷者都违约。
Yet economists who have looked at the pattern of payments on subprime mortgages point out that even when house prices topped out and then began to fall, not all subprime borrowers defaulted.
在世界竞争中，日本制造商也有违反客观规律的价格优势，因为他们的货币，日圆，是被低估的。
Japanese manufacturers also have an unnatural price advantage in world competition because their currency, the yen, is undervalued.
它们的数学模型依赖于过去的交易规律，在其它证券价格变化(例如下跌)时，预测某种证券未来的表现。
Their mathematical models rely on past trading patterns to predict how particular securities will perform in the future if other securities, say, fall in price.
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