ACC 100 Lecture Notes - Lecture 9: Inferior Good, Antivenom, Normal Good

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Price elasticity of demand is the ratio of the percentage change in quantity demanded to the percentage change in price as we move along the demand curve. Positive percentage change in price (rise in price)leads to a negative percentage change in quantity demanded. Negative percentage change in price (fall in price) leads to a positive percentage change in the quantity demanded. Price of elasticity is always written as a negative. The greater the price elasticity of demand, the more responsive the quantity demanded is to the price. When price elasticity of demand is large - consumers change their quantity demanded by a large percentage compared with the percentage change in price. When price elasticity is small - when quantity demanded will fall by a small amount when price rises - is an inelastic demand. Perfectly inelastic demand = when the percentage change in the quantity demanded is zero and the price elasticity of demand is zero.

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