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Inada conditions : ウィキペディア英語版
Inada conditions
In macroeconomics, the Inada conditions, named after Japanese economist Ken-Ichi Inada, are assumptions about the shape of a production function that guarantee the stability of an economic growth path in a neoclassical growth model. The conditions as such had been introduced by Hirofumi Uzawa.
The six conditions for a given function f(x) are:
#the value of the function f(x) at 0 is 0: f(0)=0
#the function is continuously differentiable,
#the function is strictly increasing in x_: \partial f(x)/\partial x_>0,
#the second derivative of the function is negative in x_ (thus the function is concave): \partial^ f(x)/\partial x_^<0,
#the limit of the first derivative is positive infinity as x_ approaches 0: \lim_ \partial f(x)/\partial x_i =+\infty,
#the limit of the first derivative is zero as x_ approaches positive infinity: \lim_ \partial f(x)/\partial x_i =0
It can be shown that the Inada conditions imply that the elasticity of substitution is asymptotically equal to one (although the production function is ''not'' necessarily asymptotically Cobb–Douglas).
In stochastic neoclassical growth model, if the production function does not satisfy the Inada condition at zero, any feasible path converges to zero with probability one provided that the shocks are sufficiently volatile.
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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