Gordon growth model and two-stage DDM: CFA Level I
The Gordon growth model values a share as next year's dividend divided by the required return minus the constant growth rate, V0 = D1 / (r - g), with r above g. Rearranged, the dividend yield equals r - g. A two-stage model discounts the high-growth dividends and a Gordon terminal value back to today.
The constant-growth model
If dividends grow at a constant rate g forever, V0 = D0 x (1 + g) / (r - g) = D1 / (r - g), where r must exceed g.
Example: the dividend just paid is USD2.00, g is 4% and r is 9%. D1 = 2.00 x 1.04 = USD2.08. V0 = 2.08 / (0.09 - 0.04) = USD41.60.
The model suits companies whose dividends grow at a stable rate comparable to or below the economy's nominal growth rate, and broad equity indexes. Its values are very sensitive to r and g.
Yield plus growth
Rearranged, D1 / V0 = r - g, and if price equals value, r = D1 / P0 + g. In the example, 2.08 / 41.60 = 5.0% = 9% - 4%.
With the same required return, a lower dividend yield means faster expected growth. Two shares priced at r = 8%, one yielding 2.5% and one 5.0%, imply growth of 5.5% and 3.0%.
The model can be turned round to find the growth rate implied by a price. If only the dividend just paid is known, D1 = D0 x (1 + g), so g appears on both sides and must be solved for.
Two-stage DDM, worked
Value = present value of the high-growth dividends + present value of a terminal value at the end of the high-growth period. The terminal value uses the Gordon model with the first dividend of the stable period.
Example: D0 = USD1.00, growth 10% for two years then 3% forever, r = 8%. D1 = 1.10, D2 = 1.21, D3 = 1.21 x 1.03 = 1.2463.
Terminal value at the end of year 2 = 1.2463 / (0.08 - 0.03) = USD24.926. V0 = 1.10 / 1.08 + (1.21 + 24.926) / 1.08^2 = 1.019 + 22.407 = USD23.43.
Where the exam catches people
Believing the Gordon model uses the dividend just paid in the numerator: it uses D1, next period's dividend.
Believing a high dividend yield means a higher expected return when r is the same: it means slower expected growth.
Believing the terminal value is already a present value: the Gordon formula gives a value one period before the dividend used, which must still be discounted to today.
Believing the model works when g is at or above r: it requires r greater than g.