ECON111 Lecture Notes - Lecture 4: Midpoint Method, Latte, Opportunity Cost

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30 Aug 2018
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Price elasticity of demand is a measure of the extent to which the quantity demanded of a good changes when the price of the good changes. To determine the price elasticity of demand, we compare the percentage change in the quantity demanded with the percentage change in price. Suppose zarraffa"s raises the price of a latte from to a cup. Percentage change in price = ( - / ) *100 = 66. 67% Suppose zarraffa"s cuts the price of a latte from to a cup. Percentage change in price = (new price initial price / initial price) *100. Percentage change in price = ( - / ) *100 = -40% The same price change, , over the same interval, to , is a different percentage change depending on whether the price rises or falls. We need a measure of percentage change that does not depend on the direction of the price change.

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