FINA 410 Lecture Notes - Lecture 8: Capital Asset Pricing Model, Equity Premium Puzzle, Public Company

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Chapter 8 estimating risk parameters and costs of financing. The sources of capital have to be weighted by their relative market values. Firms raise money by: equity investors: where er includes a premium for equity risk = ke, lenders: where er includes a premium for default risk = kb. We know how to solve for premium and rf, now we want to estimate beta. There are 3 approaches to estimating beta: In capm = beta measure the risk investment adds to market portfolio. In multifactor = more than one beta: using historical data of market prices for individual investments, from the fundamental characteristics of the investment, using accounting data. Historical market betas: conventional approach: use regression of returns on the investment against returns on the market index. In practice, we use a stock index like s&p 500 as a proxy for the market portfolio, and we estimate betas for stocks against this index.

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