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- 1. Risk on Portfolio• It is not the same risk on individual securities.• The risk on the portfolio is reflected in the variability of returns from zero to infinity.• Two measures of risk are average absolute deviation and standard deviation.
- 2. Capital Asset Pricing Model• CAPM is an framework for determining the equilibrium expected return for risky assets.• Relationship between expected return and systematic risk of individual assets or securities or portfolios.• William F Sharpe developed the CAPM. He emphasized that risk factor in portfolio theory is a combination of two risk , systematic and unsystematic risk.
- 3. Elements of CAPM1. Capital Market Line – risk return relationship for efficient portfolios.2. Security Market Line – Graphic depiction (representation) of CAPM and market price of risk in capital markets. a) Systematic Risk b) Unsystematic Risk3. Risk Return Relationship4. Risk Free Rate5. Risk Premium on market portfolios6. Beta - - Measure the risk of an individual asset value to market portfolio. Assets- a). Defensive Assets and b). Aggressive Assets.
- 4. Total Risk = Systematic Risk +STD DEV OF PORTFOLIO RETURN Unsystematic Risk Unsystematic risk Total Risk Systematic risk NUMBER OF SECURITIES IN THE PORTFOLIO
- 5. • Systematic risk… – It cannot be eliminated through diversification – It can be measured in relation to the risk of a diversified portfolio or the market. – According to CAPM, the Non-Diversifiable risk of an investment or security or asset is assessed in terms of the beta co-efficient.
- 6. • Unsystematic or Diversifiable Risk – Is that portion of the total risk of an investment that can be eliminated or minimized through diversification. – Eg. Management Capabilities and decisions, Strikes, unique government regulations, availability of raw materials, competition, etc.,
- 7. Assumptions of CAPM1. Individuals are risk averse.2. Individuals seek maximizing the expected return3. Homogeneous expectations4. Borrow or Lend freely at risk less rate of interest.5. Market is perfect6. Quantity of risky securities in market is given.7. No transaction cost.
- 8. CAPM FormulaCAPMRs = Rf + β (Rm – Rf)Rs = Expected Return/ Return required on the investmentRf = Risk-Free Return/ Return that can be earned on a risk- free investmentRm = Average return on all securitiesβ = The securities beta (systematic) risk factor.
- 9. Rj = Rf + j(RM - Rf)Required Return RM Risk Premium Rf Risk-free Return M = 1.0 Systematic Risk (Beta)
- 10. Calculation of Beta• Beta measures non-diversifiable risk• It shows how the price of a security responds to market forces.• In effect, the more responsive the price of a security is to changes in the market, the higher will be its beta.• Betas can be positive or negative however, all betas are positive and most betas lie between 0.4 to 1.9.
- 11. • Investors will find beta helpful in assessing systematic risk and understanding the impact market movements can have on the return expected from a share of stock.• CAPM uses beta to viewed both as a mathematical equation and graphical, as the security market line (SML).

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