Question 4 : This question is similar to Questions 15 and 16 in Chapter 5 of the textbook. Consider two horizontally differentiated firms, X and Y. Each firm has constant marginal cost of $20 (assume no fixed cost). Demand functions are: Qx = 100 - 2Px + Pri Qy = 100 - 2Py + Px (a) Solve for the Bertrand equilibrium (with differentiation) given the above Information. (b) How do you think equilibrium would change if cross-price elasticities of demand increase? Briefly explain. How would you alter equations to show increased cross-price elasticity? Briefly explain.