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Lecture 23 - The Mutual Fund Theorem and Covariance Pricing Theorems

Lecture 23 - The Mutual Fund Theorem and Covariance Pricing Theorems

This video was recorded at YALE - ECON 251 - Financial Theory. This lecture continues the analysis of the Capital Asset Pricing Model, building up to two key results. One, the Mutual Fund Theorem proved by Tobin, describes the optimal portfolios for agents in the economy. It turns out that every investor should try to maximize the Sharpe ratio of his portfolio, and this is achieved by a combination of money in the bank and money invested in the "market" basket of all existing assets. The market basket can be thought of as one giant index fund or mutual fund. This theorem precisely defines optimal diversification. It led to the extraordinary growth of mutual funds like Vanguard. The second key result of CAPM is called the covariance pricing theorem because it shows that the price of an asset... Show More
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