Please help me about the meaning of this sentence!Many often drop the minus sign since the own price elasticity is always negative

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Please help me about the meaning of this sentence!
Many often drop the minus sign since the own price elasticity is always negative

许多人常常漏掉减号,因为特有的价格伸缩性总是负数.

许多人常常省略减号，因为价格伸缩性总是负值。
The minus sign"-" is always omited, because generally the price is lowered down.

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