Overview

The Capital Asset Pricing Model (CAPM) is a formula that helps investors figure out what return they should expect from an investment based on how risky it is. It connects the risk of an investment to the potential reward, making it a fundamental tool in finance for pricing stocks and making investment decisions.

Key Points

• CAPM calculates expected return by combining the risk-free rate, market risk premium, and an asset's beta (sensitivity to market movements)
• The risk-free rate represents the guaranteed return from the safest investments, typically government bonds
• Beta measures how much an investment moves compared to the overall market, with a beta of 1 meaning it moves exactly with the market
• The model assumes investors are rational and that markets are efficient, though real-world conditions often differ
• CAPM helps investors decide whether an investment's expected return justifies its level of risk

Why This Matters

CAPM is widely used by investment professionals, financial analysts, and companies to make decisions about buying stocks, evaluating projects, and determining fair prices for securities. Understanding this model helps you grasp how financial markets value risk and return, which is essential for making informed investment choices.

Suggested Next Steps

• Portfolio Theory and Diversification
• Understanding Beta and Market Risk
• Introduction to the Efficient Frontier

Sources

• Principles of Corporate Finance by Brealey, Myers, and Allen
• The Intelligent Investor by Benjamin Graham