Dominance and Monopoly

The other case is dominance in the market. When very large market shares raise a presumption that a firm is dominant, which may be rebuttable. If a firm has a dominant position, then there is "a special responsibility not to allow its conduct to impair competition on the common market". Similarly as with collusive conduct, market shares are determined with reference to the particular market in which the firm and product in question is sold. Then although the lists are seldom closed, certain categories of abusive conduct are usually prohibited under the country's legislation. Forms of abuse relating directly to pricing include price exploitation. It is difficult to prove at what point a dominant firm's prices become "exploitative" and this category of abuse is rarely found.…