Fight Finance

Courses  Tags  Random  All  Recent  Scores

Scores
keithphw$6,001.61
Yizhou$489.18
Visitor$482.43
Visitor$370.00
allen$340.00
Visitor$300.00
Donnal$190.00
Visitor$150.00
Visitor$130.00
Visitor$119.09
Visitor$110.00
Mahmood$109.43
Visitor$100.00
Visitor$70.00
Visitor$60.00
Visitor$60.00
Visitor$50.00
Visitor$50.00
Visitor$42.65
Visitor$40.09
 

Question 65  annuity with growth, needs refinement

Which of the below formulas gives the present value of an annuity with growth?


Hint: The equation of a perpetuity without growth is: ###V_\text{0, perp without growth} = \frac{C_\text{1}}{r}###

The formula for the present value of an annuity without growth is derived from the formula for a perpetuity without growth.

The idea is than an annuity with T payments from t=1 to T inclusive is equivalent to a perpetuity starting at t=1 with fixed positive cash flows, plus a perpetuity starting T periods later (t=T+1) with fixed negative cash flows. The positive and negative cash flows after time period T cancel each other out, leaving the positive cash flows between t=1 to T, which is the annuity.

###\begin{aligned} V_\text{0, annuity} &= V_\text{0, perp without growth from t=1} - V_\text{0, perp without growth from t=T+1} \\ &= \dfrac{C_\text{1}}{r} - \dfrac{ \left( \dfrac{C_\text{T+1}}{r} \right) }{(1+r)^T} \\ &= \dfrac{C_\text{1}}{r} - \dfrac{ \left( \dfrac{C_\text{1}}{r} \right) }{(1+r)^T} \\ &= \dfrac{C_\text{1}}{r}\left(1 - \dfrac{1}{(1+r)^T}\right) \\ \end{aligned}###

The equation of a perpetuity with growth is:

###V_\text{0, perp with growth} = \dfrac{C_\text{1}}{r-g}###


Copyright © 2014 Keith Woodward