单词 | constant elasticity of substitution |
释义 | constant elasticity of substitution = (CES) The property of production or utility functions such that the ratio between proportional changes in relative prices and proportional changes in relative quantities is always the same. A CES function may be written z = k[δxρ + (1 - δ)yρ ]1/ρ, where z is output or utility, x and y are inputs and k is a constant. The ratio of proportional changes in relative quantities to proportional change in relative prices is the elasticity of substitution, σ = 1/(1 - ρ); if 1 > ρ > 0, σ > 1 and the goods are good substitutes; if ρ < 0, σ < 1 and the goods are poor substitutes. The Cobb-Douglas function is the case corresponding to γ = 0; in this case σ = 1. See also: elasticity of substitution |
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