In this equation, the long-run growth rate (g) can be approximated by multiplying the firm’s return on assets by the retention
ratio. Generally speaking, the long-run growth rate of a firm is likely to fall between 5% and 8% a year.
In this stock valuation model, we first assume that the dividend and stock will grow forever at a constant growth rate.
Naturally, assuming a constant growth rate for the rest of eternity is a rather bold statement. However, considering the
implications of imperfect information, information asymmetry, and general uncertainty, perhaps our assumption of constant
growth is reasonable. It is reasonable to guess that a given firm will experience ups and downs throughout its life. By
assuming constant growth, we are trying to find the average of the good times and the bad times, and we assume that we will
see both scenarios over the firm’s life. In addition to assuming a constant growth rate, we will be estimating a long-term
required return for the stock. By assuming these variables are constant, our price equation for common stock simplifies to the