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Isoelastic function : ウィキペディア英語版
Isoelastic function
In mathematical economics, an isoelastic function, sometimes constant elasticity function, is a function that exhibits a constant elasticity, i.e. has a constant elasticity coefficient. The elasticity is the ratio of the percentage change in the dependent variable to the percentage causative change in the independent variable, in the limit as the changes approach zero in magnitude.
For an elasticity coefficient r (which can take on any real value), the function's general form is given by
:
f(x) = ,

where k and r are constants. The elasticity is by definition
:\text = \frac \frac = \frac ,
which for this function simply equals ''r''.
==Examples==


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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