FIN 303 Study Guide - Midterm Guide: Risk-Free Interest Rate, Capital Asset Pricing Model, S&P 500 Index

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Investors are mean variance optimizers (best point to be along the efficient frontier) If assumptions are true: everyone holds risky portfolio m and some of the risk free asset, expected return: Deviation of risky portfolio and risk free asset. In a completely diversified portfolio, only risk associated with m should matter (i. e. covariance with m: cml compensates based on the std. deviation of a well-diversified portfolio . Capm says you are only rewarded for systematic risk even if you are not well diversified. Brinson gsmi: all will yield different results. Tests of the capm: estimate the security characteristic line. Problems with the test (garbage in garbage out: stocks were very volatile, decreased precision of the tests, did(cid:374)"t use (cid:373)arket portfolio, used a proxy (s&p 500, esti(cid:373)ated beta is(cid:374)"t the (cid:862)true(cid:863) (cid:271)eta due to sa(cid:373)pli(cid:374)g error. Investors cannot borrow at the risk free rate.

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