Определите слово

Определение: “(1) The amount a price would be reduced to purchase a commodity of lesser grade; (2) sometimes used to refer to the price differences between futures of different delivery months, as in the phrase "July at a ________ to May," indicating that the price for the July futures is lower than that of May.”

Первая буква: D

Ответ:  

Какому слову соответствует это определение?

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