Price Elasticity of Demand= 상수값 x P/Q
절대값 E > 1 -> Elastic
절대값 E < 1 -> Inelastic
절대값 E = 1 -> Unit Elastic
절대값 E = unlimited -> Perfectly Elastic
절대값 E = 0 -> Perfectly Inelastic
Income Elasticity of Demand = 상수값 x I/Q
E > 0 -> Normal Goods
E < 0 -> Inferior Goods
Cross-price Elasticity of Demand = 상수값 x P(x)/Q(y)
E(xy) > 0 -> Substitutes
E(xy) < 0 -> Complements
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