Explore how the Capital Asset Pricing Model revolutionized investing by quantifying the relationship between risk and return, and learn why investors are only compensated for risks they can't diversify away.

CAPM revolutionized how we think about risk and return by suggesting that investors should only be compensated for taking on systematic risks—the kind that affect the entire market and can't be eliminated through diversification.
Creado por exalumnos de la Universidad de Columbia en San Francisco
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Creado por exalumnos de la Universidad de Columbia en San Francisco

Eli: Hey there, financial explorers! Ever wonder why some investments seem to promise higher returns than others? Today we're diving into the Capital Asset Pricing Model, or CAPM, which might just be one of the most influential financial models of the last century.
Miles: Absolutely, Eli. CAPM revolutionized how we think about risk and return in investing. What's fascinating is that it boils down to a simple but powerful idea: investors should only be compensated for taking on risks they can't diversify away.
Eli: Wait, so you're saying I shouldn't expect extra returns just for any kind of risk I take?
Miles: That's exactly right. CAPM suggests that the market only rewards you for systematic risk—the kind that affects the entire market and can't be eliminated through diversification. The model quantifies this with something called beta.
Eli: I've heard that term before! Beta measures how volatile an investment is compared to the market, right?
Miles: You've got it. A beta of 1.5 means an investment is 50% more volatile than the market. According to CAPM, that higher volatility should come with proportionally higher expected returns. It's fascinating how this elegant formula—developed back in the 1960s by economists like William Sharpe—still forms the backbone of modern investment theory.
Eli: So this isn't just some academic exercise—it has real-world applications?
Miles: Oh, absolutely. Despite its limitations and assumptions, CAPM remains widely used for everything from valuing stocks to determining a company's cost of capital. Let's break down the formula and see exactly how it works in practice...