Elasticity of complementarity

Given the production function ${\displaystyle f(x_{1},x_{2})}$ then the elasticity of complementarity is defined as

${\displaystyle c={\frac {d\ln \left(\displaystyle {\frac {df}{dx_{1}}}/\displaystyle {\frac {df}{dx_{2}}}\right)}{d\ln(x_{2}/x_{1})}}={\frac {\displaystyle {\frac {d({\frac {df}{dx_{1}}}/{\frac {df}{dx_{2}}})}{{\frac {df}{dx_{1}}}/{\frac {df}{dx_{2}}}}}}{\displaystyle {\frac {d(x_{2}/x_{1})}{x_{2}/x_{1}}}}}.}$

The inverse of elasticity of complementarity is elasticity of substitution.

• Hamermesh, Daniel S., Labor Demand, Princeton University Press, Princeton NJ, 1993, ISBN 0-691-02587-8

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