The Dividend Discount Model (DDM) is a method of valuing a company's stock based on the hypothesis that its stock is worth the sum of all of its future dividend payments when discounted back to their present value. This approach takes into account the time value of money, presuming that receiving a dollar today is worth more than receiving one in the future because of the dollar's potential earning capacity. The DDM formula is expressed as:
\[ P_0 = \frac{D_0 (1 + g)}{r - g} \]
where:
- \(P_0\) is the present stock price,
- \(D_0\) is the dividend paid in the last period,
- \(g\) is the constant growth rate of dividends, and
- \(r\) is the required rate of return by investors.
The model operates under a set of assumptions, the most important of which are that dividends will continue to increase at a constant growth rate indefinitely and that the required rate of return does not change. It is primarily used for companies that pay dividends regularly and have a history of stable growth rates.