WFU Law School
Law & Valuation
1.3.6 Constantly Growing Perpetuity

Constantly Growing Perpetuity

Example

Company is growing. It pays most of its earnings as dividends, but retains some earnings for future growth. The practice has worked well, as its history of growth suggests.

What is the value of Company stock, based on dividend returns?

Year
Dividend/Share
1
1.00
2
1.06
3
1.15
4
1.25
5
1.36
6
1.44
7
1.59


Answer:

You can use the Gordon model in three steps--

What is the company's growth rate?

This is not obvious and requires a judgment call. Do we predict that growth will continue at the average annual growth rate for the last 6 periods? To compute this we could find the average growth rate. Or do we predict that growth will continue at the overall rate of the last seven years? To compute this we would find the internal growth rate over the 6 years of growth, in which the dividend went from 1.00 to 1.59.

Year
Dividend/share
Growth
Internal rate of growth
1
1.00
   
2
1.06
6.00%
 
3
1.15
8.49%
 
4
1.25
8.70%
 
5
1.36
8.80%
 
6
1.44
5.88%
 
7
1.59
10.42%
 
Average
8.05%
8.15%

The internal rate of return can be determined by using the present value formula and calculating the interest rate. This means i = (FV/PV)^(1/n) -1.

Usually, business valuators use the internal rate of growth, since it reflects the growth rate over a period better than an average. In effect, it gives you an idea of the internal "growth machine" of the business.

What is the required return (discount rate) for Company's stock?

This is even trickier. One method is to use the CAPM -- which predicts the company's expected return (required return or discount rate) based on the stock's expected volatility and the market's expected return. For now, let's assume the discount rate is 14.0%.

As we saw before in computing value under different capitalization rate assumptions, the discount rate will be one of the most important (and hotly contested) issues in a valuation.

Apply the Gordon model.

P0 = D0(1 + g) / (i - g)
D0
most recent per-share dividend
$1.59
i
required return (discount rate)
14.0%
g
rate of growth
8.15%
P0
value of common stock (per share)
$1.59(1 + .0815) / (.14 - .0815)
= $29.39

Notice that the formula requires that you compute the return in the first period of growth [Do(1 +g) = $ 1.72] and then divide this by the difference of the discount rate and the growth rate [.14 - .0815 = .0585].

1.3.6 Constantly Growing Perpetuity

©2003 Professor Alan R. Palmiter

This page was last updated on: March 19, 2007