12.1 A simple investment portfolio is to consist of shares of American Snuff, General Cigar, and P. Lorrilard Company. Let Y ≡ (Y1, Y2, Y3)’, where Yj denotes the return on one share of Company j, and j = 1, 2, 3 corresponds to the three companies named. Suppose (hypothetically) it is found that Y follows the stable law [see (12.2.3)], where Find the allocation of funds among the three assets which makes the portfolio efficient in a restricted Model I sense.