3) Antitrust policy a) Consider the Horizontal Merger Guidelines. What defines a highly concentrated market? Is there a presumption of harm from a horizontal merger in a highly concentrated market? What is the economic rationale behind this presumption or lack thereof? b) Consider the UnitedHealth and Change Healthcare merger. What are the theories of vertical harm alleged by the Department of Justice? I.e., where is harm alleged to occur? Which products give the merging party the ability to inflict this alleged harm? c) Which markets did the Department of Justice allege were concentrated? Is concentration in these markets necessary for harm? What about concentration in other markets