Abuse of market dominance refers to those operators in the relevant market that can control the price, quantity or other trading conditions of the commodity, or that can hinder and affect other operators from entering the relevant market, and use their market dominance to jeopardize competition, harm competitors and Public and other private interests. According to the above definitions, Which of the following acts constitute abuses of market dominance:. ['Company A obtains control of many other operators by acquiring equity or assets, so that its market share in that place reaches more than 50%.', 'Company A. which has a market share of 55% in the edible oil market, asked a local supermarket to advertise for free on the shopping cart, but was rejected by the supermarket. Company A stopped supplying to the supermarket.', "A power company in a certain city said that many users' meters were inaccurate, requiring users to purchase meters of several brands specified by the company. After investigation, the power company had no interesting relationship with the manufacturers of the specified brands.", 'In a city with a lighter market share of 70%, the second and second factories, in order to alleviate the serious decline in sales due to the economic downturn, reached an agreement on the limited production quantity and sales price, causing many small manufacturers to go bankrupt.']