Quiz on Index Models

What is the primary focus of the Markowitz Model in portfolio selection?

• Estimates of interest rates

• Estimates of expected security returns

• Estimates of firm-specific risks

• Estimates of market volatility

How many total estimates are required for a portfolio of 50 securities in the Markowitz Model?

• 1,500

• 1,325

• 1,000

• 1,225

What happens to the number of estimates required when the number of securities is doubled from 50 to 100?

• It doubles

• It remains the same

• It nearly quadruples

• It decreases significantly

What is a potential issue with the correlation coefficients in the Markowitz Model?

• They are not needed

• They are easy to calculate

• They can lead to nonsensical results

• They are always accurate

What does the term 'positive definite' refer to in the context of correlation matrices?

• It refers to the number of securities

• It indicates consistent correlation coefficients

• It means variances can be negative

• It is a measure of market risk

What is the main advantage of introducing a model that simplifies the description of security risk?

• It eliminates the need for analysis

• It allows for easier implementation

• It increases the number of estimates needed

• It reduces the number of securities analyzed

In the single-factor model, what does the variable 'm' represent?

• Expected return

• Market risk

• Firm-specific risk

• Macroeconomic factor

What is the relationship between the unexpected return 'ei' and the macroeconomic factor 'm'?

• They are negatively correlated

• They are dependent

• They are positively correlated

• They are uncorrelated

What does the beta coefficient 'bi' measure in the single-index model?

• Firm-specific risk

• Expected return

• Market sensitivity

• Total risk

What is the expected return-beta relationship in the single-index model?

• E(Ri) = ai - biE(RM)

• E(Ri) = ai + biE(RM)

• E(Ri) = bi - aiE(RM)

• E(Ri) = bi + aiE(RM)