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→Variable rate of return: add term "force of interest" |
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*[[compound interest]]: <math>a(t)=(1+i)^t</math>
*[[simple discount]]: <math>a(t) = (1-d*t)</math>
*[[compound discount]]: <math>a(t) = (1-d)^{(-t)}</math>
In the case of a positive [[rate of return]], as in the case of interest, the accumulation function is an [[increasing function]].
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