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Prof. Robert C. Merton: ICAPM, Retirement, and Models in Finance (EP.234)

The Rational Reminder Podcast

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Capital Asset Pricing Models - How Do They Work?

The evolving investment landscape includes changing opportunity sets, interest rates, and various consumption goods, leading to uncertainty in relative prices. When advising investors, acknowledging that human capital is a significant asset, especially for younger individuals, is crucial. As human capital risks change over time, they must be optimally integrated into investment decisions. The Capital Asset Pricing Model (CAPM) provides a foundational understanding of market risk; however, it oversimplifies by only considering a single dimension of risk. A richer model emerges when accounting for multiple systematic risks, including interest rate risk, labor-capital share risks, and human capital risk, rather than limiting analysis to market risk alone. The impact of interest rates varies significantly with the investor's life stage, influencing portfolio choices. As a result, the expected return on any investment integrates weighted sums of these specific risk premiums, leading to a complex security market hyperplane where multiple risk premiums dictate the return expectations for diverse risk sensitivities among investors.

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