• Sharpe, Lintner and Mossin are researchers credited with its development (
the mid 1960’s)
• CAPM is an extension of the Markowitz portfolio selection model
• Derived using principles of Markowitz diversification
• Equilibrium model that underlies modern portfolio theory
• CAPM is a set of predictions concerning equilibrium expected returns on
risky assets.
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Assumptions of CAPM
•Individual investors are price takers (cannot influence prices)
•Single-period investment horizon
•Individuals have homogenous expectations
•No taxes, transaction costs, or restrictions on short sales (no
market frictions)
•Individuals are rational and mean variance maximizers
•Information is costless and result in no information asymmetry
•There exists unlimited lending/borrowing at the riskless rate
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What is Market Portfolio and CML
•A market portfolio is a theoretical bundle of investments that include
every type of assets available in the world financial market, with eac
asset weighted in the proportion of its total presence in the market.
•A key insight of CAPM is: Because the market portfolio is the aggrega
of all the identical risky portfolios, it will also have the same weights.
Therefore, if all the investors choose the same risky portfolio, it will b
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market portfolio.