ECON 1B03 Lecture Notes - Lecture 4: Normal Good, Root Mean Square, Inferior Good
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ECON 1B03 Full Course Notes
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Elasticity: measures how responsive qd or qs is to changes to p and other determinants. Total revenue = price x quantity selling at that price. Price elasticity of demand is a measure of how much the quantity demanded of a good responds to a change in the price of that good. Computed as the percentage change in the qd divided by the percentage change in p. Ep = % change in qd / % change in p. The number we get is our coef cient of elasticity, the size of this number will tell us how elastic the good is in price. The larger the coef cient the more responsive a good with be to a change. Inelastic demand: a change in p leads to a proportionately smaller change in qd. Demand is not very responsive to a price change. Percentage change in p > percentage change in qd (ep < 1)