Constant Growth Model is a financial valuation method that is used to estimate the intrinsic value of a stock. This model is also known as the Gordon Growth Model, after Myron Gordon, who developed the model in 1959. The constant growth model is based on the assumption that a company will continue to grow at a constant rate into the future, and that the rate of growth will be stable and predictable. The model is often used by investors to estimate the fair value of a stock, and to determine whether it is undervalued or overvalued in the market.
Assumptions of the Constant Growth Model:
-
Constant Dividend Growth Rate
The model assumes that dividends will grow at a constant and perpetual rate. This means the company’s dividend payments are expected to increase by a fixed percentage each year forever. This assumption makes the model suitable only for mature companies with a stable dividend history and predictable growth, and not for firms experiencing fluctuating earnings or irregular dividend payments.
-
Required Rate of Return is Greater than Growth Rate (k > g)
For the formula to produce a logical and finite result, the required rate of return (k) must be greater than the dividend growth rate (g). If the growth rate equals or exceeds the required return, the denominator of the formula becomes zero or negative, making the valuation undefined or negative, which is not practical. This ensures that the present value of dividends converges to a finite number.
-
Dividends are the Only Source of Return
The model assumes that investors receive returns only in the form of dividends. It does not account for capital gains, share buybacks, or any other method of returning value to shareholders. Therefore, it is not suitable for companies that reinvest profits instead of paying regular dividends.
-
Efficient Capital Markets
The model assumes that markets are efficient and that all relevant information is already reflected in stock prices. This implies that the risk and return expectations are properly priced in, and the required rate of return is accurately reflective of the company’s risk profile.
-
No Changes in Business Risk
It is assumed that the company’s business model, risk profile, and capital structure remain stable over time. Any significant shift in industry, competition, or market conditions that affects dividend patterns or risk levels would invalidate the model’s assumptions.
Formula for the Constant Growth Model:
The formula for the constant growth model is as follows:
V = D / (r – g)
Where:
V = Intrinsic value of the stock
D = Annual dividend per share
r = Required rate of return
g = Constant growth rate of the dividends
The constant growth model assumes that the value of a stock is equal to the present value of its future dividends. The dividend is divided by the difference between the required rate of return and the growth rate of the dividends. This formula can be used to estimate the intrinsic value of a stock, which can then be compared to the market price of the stock to determine whether it is undervalued or overvalued.
Example of the Constant Growth Model:
Suppose a company pays an annual dividend of $2 per share, and the required rate of return for investors is 10%. The company is expected to grow at a constant rate of 5% per year. Using the constant growth model, the intrinsic value of the stock can be calculated as follows:
V = D / (r – g)
V = $2 / (0.10 – 0.05)
V = $40
This means that the intrinsic value of the stock is $40 per share. If the market price of the stock is less than $40 per share, then the stock may be considered undervalued and a good investment opportunity.
Limitations of the Constant Growth Model:
-
Assumes Constant Growth Rate
The primary limitation of the Constant Growth Model is its assumption that dividends will grow at a constant rate indefinitely. In reality, companies experience varying growth phases—startup, expansion, maturity, and potential decline. During each phase, dividend growth rates can fluctuate significantly. This unrealistic assumption makes the model unsuitable for valuing firms with unpredictable or changing dividend patterns. Particularly for new or rapidly growing companies, the constant growth assumption oversimplifies the complex and dynamic nature of business environments and financial performance.
-
Not Suitable for Non-Dividend Paying Companies
The model is only applicable to firms that consistently pay dividends and intend to continue doing so. Many companies, especially startups or those in high-growth sectors like technology, reinvest profits instead of paying dividends. For such companies, the Constant Growth Model cannot be applied, as there are no dividends to base the valuation on. This makes the model irrelevant for a significant portion of the market and limits its usefulness for investors looking to evaluate a broad range of companies.
-
Sensitive to Input Assumptions
The Constant Growth Model is extremely sensitive to small changes in its input variables—specifically the required rate of return (k) and the growth rate of dividends (g). If the estimated growth rate is close to or greater than the required rate of return, the model can produce inflated or even negative valuations. This makes the model unstable and potentially misleading. Accurate estimation of these inputs is often difficult in practice, leading to questionable valuation results when the assumptions are even slightly off.
-
Ignores Market Conditions and External Factors
The model focuses solely on dividends and their growth, ignoring broader market conditions, economic cycles, competition, interest rates, and other macroeconomic variables that influence a company’s value. As a result, it may produce valuations that are detached from current realities. For instance, during an economic downturn, even companies with stable dividend histories might see lower valuations due to reduced investor confidence or falling industry demand—factors that the model fails to incorporate.
-
Assumes Immediate Dividend Payment
Another theoretical flaw is the assumption that dividends are paid continuously or at regular intervals starting immediately. In reality, dividends are paid quarterly, semi-annually, or annually, and companies may delay or suspend payments. The model’s simplification of immediate and perpetual dividends ignores real-world payment schedules and liquidity considerations. This can distort the true present value of future cash flows, especially when valuing companies with irregular or recently initiated dividend distributions.
-
Ignores Capital Gains and Other Income
The model considers only dividends as the source of return for investors and does not account for capital gains or other forms of income. In practice, investors also gain from stock price appreciation, share buybacks, and retained earnings that may boost future earnings. By focusing solely on dividends, the Constant Growth Model overlooks these significant value drivers, leading to an incomplete and sometimes inaccurate valuation of a company’s total return potential.