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久期是债券的price-yield曲线的斜率还是price对yield的弹性?

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久期是债券的price-yield曲线的斜率还是price对yield的弹性?
久期是债券的price-yield曲线的斜率还是price对yield的弹性?
The duration ( interest rate sensitivity ) of a bond at any yield is ( absolute value of ) the slope of the price-yield function at that yield.