According to traditional economic pricing theory,price elasticity tends to be a negative number.

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Price elasticity is defined as the percentage change in quantity demanded divided by the percentage change in price. Since a decrease in price usually results in an increase in quantity demanded (and vice versa), price elasticity tends to be negative. However, in rare cases, such as with Giffen goods, price elasticity can be positive.

According to Traditional Economic Pricing Theory,price Elasticity Tends to Be