FIN 260 Lecture Notes - Lecture 49: Capital Asset Pricing Model, 3Com, American Finance Association

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Empirical evidence against efficient markets (price is not right), bubbles: Bubbles should not exist in efficient markets: a bubble says that the market is overvalued for a prolonged period of time. Plot shiller shows p/e ratios for u. s. stocks since 1900: clearly there are bubbles, 1929, 1966, 2000, if you bought the stock market during the height of the bubble in. September 1929), it took on average 29 years for you to get your money back: if you bought at the height of the bubble in 1966, it took 26 years to get your money back. If it takes that long to just get your money back, it strongly suggests the prices were way overvalued when you bought in: which again should not happen if efficient markets holds, capm does not work: There is a lot of data to suggest that capm completely fails as a model to explain reality. In december 2010, john cochrane, president of american finance.

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