FINC-212 Lecture Notes - Lecture 8: Market Risk, Capital Asset Pricing Model, Efficient-Market Hypothesis

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Multi-factor models: market risk must come from macroeconomic factors, since market risk affects all investment indiscriminately, market risk = risk exposures of any asset to macroeconomic factors. While the capm is flawed, it is still the default model for equity valuation and corporate finance. Alternative models are more accurate with explaining past returns, but are less effective at estimating expected future returns. Alternative models are more complicated and require more information than the capm. The expected returns you get with alternative models are not different enough to justify the extra effort of estimating additional betas. Cf : risk-free rates must be in the same currency that your cashflows are estimated in. Conventional practice of estimating risk-free rates: use the government bond rate, with government being the issuer of the currency, (e. g. the risk free rate in the us can be 10-year us treasury bond)

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