Both the index duration and the spread duration are the decreasing functions of the discount margin.

利率久期和利差久期都是贴现利差的递减函数。

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If Party a rents other cars, Party a shall enjoy much discount and has the priority to rent the car at the same price when the duration of the contract is expired.

再次租用乙方其他车辆，可以大幅度优惠。合同期满后，甲方有优先权以同等价格续租乙方车辆。

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The season was really a win for the consumer, however, with stores all pulling out the discount signs and holding them for the duration of the holiday season.

FORBES: Holiday Sales Winners And Losers: Macy's, J.C. Penney