The own price elasticity of the market demand for cigarette is -0.4% if the price falls by 5%, by what percentage will be quantity?
Price elasticity demand =%change in Q.D÷% change in price=-0.4
%change in price=5%
% change in Q.D=?
Therefore: % change in Q.D=Price elasticity demand×%change in price
% change in Q.D=-0.4×5
=-2.0%
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