Unless goods are Giffen goods, own-price elasticities of demand are always negative.

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Own-price elasticity of demand is a measure of the responsiveness of the quantity demanded to a change in the price of a product. According to the law of demand, as the price of a product increases, the quantity demanded decreases, resulting in a negative relationship between price and quantity demanded. Therefore, unless goods are Giffen goods (inferior goods with a positively sloped demand curve), the own-price elasticity of demand is always negative.

Unless Goods Are Giffen Goods, Own-Price Elasticities of Demand Are