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Techniques for Estimating the Cost of Capital

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Part I. Estimating the cost of capital is challenging, because the cost of capital effectively puts a price on the risk of the project. If we know the risk, it would not be risk, it would be certainty. Inherently, then, there is a philosophical challenge with finding a good estimate of the firm's cost of capital. It is assumed, however, that the market view of the firm is a fairly accurate reflection of the company's risks. The main techniques for estimating the cost of capital, therefore, are market based. In general, these market based solutions are only used to determine the cost of equity with the scope of a broader weighted-average cost of capital equation. The first technique is the dividend growth model. This model assumes that the stock price reflects the discounted future cash flows of owning the stock, which is the dividends that the company is paying plus an estimate of the future growth rate of the dividend payment (Investopedia, 2012). For companies that do not pay a dividend, it is assumed that there will be a dividend in the future in order to make this model work. The capital asset pricing model work on the theory that the firm's stock price reflects not the dividend but the capital gains associated with the fluctuation of the company's stock in relation to the market. The CAPM formula is as follows:

Ra = Rf + β(Rm-Rf) where Rf is the risk-free rate and Rm-Rf is the market risk premium. The capital asset pricing model uses historic data, which makes it

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