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from Part III - Asset Pricing and Financial Markets
Published online by Cambridge University Press: 23 January 2025
In the previous chapter we went over the process by which investors form portfolios, how to measure the risk and return of a given portfolio, and how an optimal portfolio can be chosen from a riskless asset and a set of risky assets. We saw that the optimal portfolio consists of holding some portion of one’s money in the riskless asset and some portion in the tangency portfolio consisting of the optimal combination of risky assets (OCRA). In this chapter we introduce the capital asset pricing model (CAPM), which specifies exactly what the OCRA should be. The CAPM predicts, under a set of assumptions, that the OCRA consists of holding all assets in the market in proportion to their value. Thus, all investors should hold some combination of the market portfolio and the riskless asset because it is most efficient.
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