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What is Capital Asset Pricing Model (CAPM)?
Grade Level:
Class 12
AI/ML, Physics, Biotechnology, FinTech, EVs, Space Technology, Climate Science, Blockchain, Medicine, Engineering, Law, Economics
Definition
What is it?
The Capital Asset Pricing Model (CAPM) is a formula used to calculate the expected return an investor should get from an investment, considering its risk. It helps investors decide if an investment is worth taking by comparing its expected return to its riskiness.
Simple Example
Quick Example
Imagine you want to buy shares in a company that makes popular electric scooters. CAPM is like a calculator that tells you, 'Based on how risky this scooter company's shares are compared to the overall market (like the Sensex), you should expect to earn at least a certain percentage profit.' If the company promises less than that, maybe it's not a good deal.
Worked Example
Step-by-Step
Let's calculate the expected return for a share using CAPM.
Here's the formula: Expected Return = Risk-Free Rate + Beta * (Market Return - Risk-Free Rate)
Let's assume:
- Risk-Free Rate (like interest from a safe government bond) = 5% (or 0.05)
- Market Return (average return from the stock market) = 12% (or 0.12)
- Beta (how much the share's price moves compared to the market) = 1.5
Step 1: Find the 'Market Risk Premium'. This is (Market Return - Risk-Free Rate).
Market Risk Premium = 0.12 - 0.05 = 0.07 (or 7%)
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Step 2: Multiply the Market Risk Premium by Beta.
Beta * Market Risk Premium = 1.5 * 0.07 = 0.105 (or 10.5%)
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Step 3: Add the Risk-Free Rate to the result from Step 2.
Expected Return = 0.05 + 0.105 = 0.155
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Answer: The expected return for this share is 15.5%.
Why It Matters
CAPM is super important in finance and economics, helping banks, investment firms, and even FinTech companies decide where to put their money. Knowing CAPM can open doors to careers as a Financial Analyst, Portfolio Manager, or even in AI/ML roles predicting stock movements.
Common Mistakes
MISTAKE: Thinking Beta is the same as overall risk. | CORRECTION: Beta only measures 'systematic risk' (market risk), not 'unsystematic risk' (company-specific risk). CAPM focuses on systematic risk because unsystematic risk can be reduced by diversifying investments.
MISTAKE: Confusing the Risk-Free Rate with any bank's savings account interest. | CORRECTION: The Risk-Free Rate is typically based on the return from a very safe investment, like short-term government bonds (e.g., Indian Treasury Bills), not regular savings accounts.
MISTAKE: Using CAPM to predict exact future returns. | CORRECTION: CAPM provides an *expected* return, which is a theoretical value. Actual returns can be higher or lower due to many unpredictable factors in the real world.
Practice Questions
Try It Yourself
QUESTION: If the Risk-Free Rate is 4%, Market Return is 10%, and Beta is 1.2, what is the expected return using CAPM? | ANSWER: 11.2%
QUESTION: A share has an expected return of 13%, a Risk-Free Rate of 6%, and a Market Return of 11%. What is its Beta? | ANSWER: 1.4
QUESTION: Company A has a Beta of 0.8, and Company B has a Beta of 1.5. If the Risk-Free Rate is 5% and Market Return is 12%, which company is expected to give a higher return and by how much? | ANSWER: Company B is expected to give a higher return (15.5%) compared to Company A (10.6%), a difference of 4.9%.
MCQ
Quick Quiz
What does Beta in the CAPM formula primarily measure?
The total risk of an investment
The risk-free rate of return
The sensitivity of an asset's return to the market's return
The expected profit margin of a company
The Correct Answer Is:
C
Beta measures how much an asset's price tends to move in relation to the overall market. It's a key component of systematic risk, not total risk or profit margin.
Real World Connection
In the Real World
In India, financial advisors working for companies like Zerodha or Groww use principles similar to CAPM when recommending mutual funds or stocks to investors. They assess the risk of different investments against the expected market returns to help people make smart choices for their savings, like planning for a child's education or buying a home.
Key Vocabulary
Key Terms
RISK-FREE RATE: The return on a theoretical investment with zero risk, like government bonds. | MARKET RETURN: The average return from the overall stock market. | BETA: A measure of how much an investment's price moves compared to the overall market. | MARKET RISK PREMIUM: The extra return investors expect for taking on market risk, calculated as (Market Return - Risk-Free Rate).
What's Next
What to Learn Next
Now that you understand CAPM, you can explore concepts like 'Modern Portfolio Theory' and 'Sharpe Ratio'. These build on CAPM by showing how to combine different investments to create a balanced portfolio that manages risk and maximizes returns.
