30-Recently in a small city, building contractors lobbied the city council to pass a law requiring all people working on residential dwellings be licensed by the city. Why would the contractors lobby for this requirement? A) to reduce the cost of building dwellings B) there is no good explanation for this type of lobbying. C) to guarantee that work on dwellings is of high quality D) to create a legal barrier to entry 31-Oligopolistic firms can earn positive economic profits A) in the short run, but not in the long run. B) in the short run and in the long run. C) in the long run, but not in the short run. D) in neither the short run nor the long run. 32-The "kinked" oligopoly demand curve is a result of the assumption by an oligopolist that