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Discount function : ウィキペディア英語版
Discount function
A discount function is used in economic models to describe the weights placed on rewards received at different points in time. For example, if time is discrete and utility is time-separable, with the discount function
:f(t) and with c(t) defined as consumption at time t,
total utility is given by
:U(\_^\infty)=\sum_^\infty .
Total utility in the continuous-time case is given by
:U(\_^\infty)=\int_^\infty
provided that this integral exists.
Exponential discounting and hyperbolic discounting are the two most commonly used examples.
==See also==

*Discounted utility
*Intertemporal choice
*Temporal discounting

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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