5. Answer the following questions about monopolies. a) Name and briey describe two types of barriers to entry that might help create a monopoly. b) Is a monopoly efficient in the short-run? Is a monopoly efcient in the long-run? c) Name two factors (other than HHI) that are considered when antitrust authorities are evaluating a horizontal merger. What is the highest HHI can be in a market? What is the lowest HHI can be in a market? Are antitrust authorities more concerned about a merger when HHI is high or low? ' ' \""' 1:1