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In the example developed in Table 7.3, suppose there are four identical firms with the same return pattern, and the investor again has $200 to invest.
(a) Compute the portfolio variance associated with a strategy of investing $50 in each stock. To do this you can use a property of the variance of a portfolio: when the stock prices move independently, the variance of the portfolio of stocks is the sum of the variance of each stock. So compute the variance of each stock, where $50 is invested in each, and the variance of the portfolio will be four times this amount.
Table 7.3
Derive an expression for the firm's marginal revenue curve. b. To maximize profit, how many lasers should the firm produce and sell per month c. If this number were produced and sold, what would be the firm's monthly profit
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