\f31. According to the Chicago school, how should anti-trust enforcement operate? a. Any merger that significantly increased market concentration should be banned b. If a merger creates more efficiency through lower costs than deadweight loss created, it could be allowed C. Anti-trust should only operate in ways that protect the consumer from unfair practices, such as price gouging and false advertising d. Anti-trust should only block mergers based on their intentto create a monopoly rather than the outcome of a monopoly e. None of the above reflect the Chicago approach to anti-trust enforcement 32. What is the difference between the short run and the long run? a. All inputs are variable in the long run, while there is at least one fixed input in the short run b. All firms attempt to maximize profits in the long run, while some of them may choose not to in the shortrun c. Firms will only earn economic profits in the long run; they break even in the short run d. There is no difference between the short run and the long run in economics e. None of the above are differences between the short run and long run. 33. Which of the following is always true about the firm's optimal plant size? a. The optimal plantis where long run average costs are minimized b. The optimal plant is where short run average costs are minimized C. The optimal plant operates with economies of scale d. The optimal plant operates with decreasing returns to scale e. None of the above are true about the firm's optimal plant size