(b) Suppose there are 10 such rms, all identical. What is the industry supply curve? (c) The demand curve for shafts is given by Qd = 20,000 200P, Where Qd is the number of shafts demanded annually. What is the equilibrium quantity of a shaft, and what is the equilibrium price? (d) Suppose that due to a drOp in the price of stainless steel, the marginal cost of producing a shaft falls. Each rm's marginal cost is now Marginal Cost 2 0.25 + 0.025Q and total cost is Total Cost 2 15, 600 + 0.2562 + 0.0125622, How do the equilibrium prices and quantities change as a result