当8月17号贴现率下调，联储第一次确认信贷紧缩有可能危及美国经济。
When the Fed cut its discount rate on August 17th, it admitted for the first time that the credit crunch could hurt the economy.
他们一直在缩减，贴现率与，联邦资金利率之间的宽度，同样它又是刺激经济的努力。
They've been cutting the spread between the discount rate and the Federal Funds rate again it's an effort to stimulate the economy.
该工程的经济内部收益率为13.41%，大于社会贴现率12%，所以该工程在经济上是合理的。
Its economic internal rate of return is 13.41%, larger than its social discount rate 12%, therefore, the project is economically rational.
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