Consider a firm in an oligopoly in which a few sellers offer differentiated brands of widgets. Suppose that if Firm 1 were to cut its price in order to sell more widgets, its competitors would quickly lower their own prices to protect their market shares. If, however, Firm 1 were to raise its price, its competitors would not follow, and Firm 1 would lose market share. Under these (non-ceteris-paribus) assumptions, the demand curve faced by Firm 1 is, in effect, highly elastic at prices above the current price, and less elastic at prices below the current price. Suppose that Firm 1's current price is P* = $10 and it sells Q* = 4 widgets per day. If Firm 1 were to raise its price, it would face the demand: P = 12 – 2Q (P > 10) If Firm 1 were to reduce its price, it would face the demand: P = 14 - Q (P< 10) a) Write the firm's marginal revenue function for prices above and below $10. MR = (P > 10, so: Q* < 4) MR = (P < 10, so: Q* > 4) b) GRAPH Firm l's demand (D) and marginal revenue (MR) curves. Label point E (4, $10). c) Firm 1 has no incentive to change its price as long as: < MC < $_ d) Calculate the elasticity of demand for each demand function at E(4, $10). If Firm 1 raises price: ED = If Firm 1 lowers price: ED =

Mark is currently earning $44,000 a year. He has worked for this firm for 5 years. He is considering a job that will increase his lifetime earnings by $240,000 but that requires a Ph.D. in finance. The job will mean also attending a full-time finance program for four years at an annual cost of $28,500. Mark already completed an MBA, for which he spent $86,000 in tuition and books. Would he take the job and attend the Ph.D. program? Calculate:   Insutructions: Use ono decimals. Use commas (30,000, not 30000). Opportunity costs of this decision = $ MC = $ MB = $ Sunk Costs = $

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