Unformatted text preview: percentage change of quantity, so when the price rises (falls) for example, the rise (fall) of price leads to a even larger the drop (rise) in quantity, as a result, the total revenue, which is a product of price and quantity, decreases (rises). A mathematic explanation is as following: R: revenue P: price Q: quantity e: elasticity P e R P P P Q R P Q R P dP Q dQ R dR QdP PdQ dR PQ R Δ + = Δ Δ + Δ Δ Δ = Δ Δ + Δ = Δ + = + = = )% 1 ( % % % % % % % % % The last step arrives based on the definition of elasticity: P Q e Δ Δ = % % Therefore, in the last equation, P e R Δ + = Δ )% 1 ( % For inelastic demand, 1< e <0, so (e+1) is positive. Therefore, R Δ % and move towards the same direction. P Δ % For elastic demand, e < 1, so (e+1) is negative. Therefore, R Δ % and move towards the opposite direction. P Δ %...
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 Fall '07
 Yezer
 Economics, Supply And Demand, Pingkang Yu

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