Consumption-Based Model and Basic Pricing model Basic question to decide for an investor: (1) how much to save; (2)how much to consume; (3)what portfolio of assets to hold. Pricing equation come from the first order condition for this decision
Arbitrage Pricing Theory Arbitrage-arises if an investor can construct a zero investment portfolio with a sure profit Since no investment is required, an investor can create large positions to secure large levels of profit
Fourth Edition Advantages of the Single Index Model Reduces the number of inputs for diversification. Portfolio of 50 assets 50 expected returns;50 variances 1225 covariance. too difficult a task