16. a) Consider a universe of risky assets. Draw a portfolio j which is not efficient and a portfolio j* which is efficient and has the same expected return. Label your axes.
    2. Draw an Index I which is efficient and another portfolio Z* which has zero beta to I (on the same graph).
17. 3. Explain with expected return and risk equations (for j and j*) why there is no expected return to unsystematic risk.