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  2. Concentration ratio - Wikipedia

    en.wikipedia.org/wiki/Concentration_ratio

    The and concentration ratios are commonly used. Concentration ratios show the extent of largest firms' market shares in a given industry. Specifically, a concentration ratio close to 0% denotes a low concentration industry, and a concentration ratio near 100% shows that an industry has high concentration.

  3. Herfindahl–Hirschman index - Wikipedia

    en.wikipedia.org/wiki/Herfindahl–Hirschman_index

    If the resulting figure is above a certain threshold then economists will consider the market to have a high concentration (e.g. market X's concentration is 0.142 or 14.2%). This threshold is considered to be 0.25 in the U.S., [ 9 ] while the EU prefers to focus on the level of change, for instance that concern is raised if there is a 0.025 ...

  4. Oligopoly - Wikipedia

    en.wikipedia.org/wiki/Oligopoly

    The higher the four-firm concentration ratio is, the less competitive the market is. When the four-firm concentration ration is higher than 60, the market can be classified as a tight oligopoly. A loose oligopoly occurs when the four-firm concentration is in the range of 40-60. [21]

  5. Market concentration - Wikipedia

    en.wikipedia.org/wiki/Market_concentration

    Market concentration is affected through various forces, including barriers to entry and existing competition. Market concentration ratios also allows users to more accurately determine the type of market structure they are observing, from a perfect competitive, to a monopolistic, monopoly or oligopolistic market structure.

  6. Market structure - Wikipedia

    en.wikipedia.org/wiki/Market_structure

    N-firm concentration ratio, N-firm concentration ratio is a common measure of market structure. This gives the combined market share of the N largest firms in the market. [ 9 ] For example, if the 5-firm concentration ratio in the United States smart phone industry is about .8, which indicates that the combined market share of the five largest ...

  7. Market power - Wikipedia

    en.wikipedia.org/wiki/Market_power

    Moreover, studies indicate that a concentration ratio of between 40 and 70 percent suggests that the firm operates as an oligopoly. [38] These figures are viable but should be used as a 'rule of thumb' as it is important to consider other market factors when analysing concentration ratios.

  8. Tacit collusion - Wikipedia

    en.wikipedia.org/wiki/Tacit_collusion

    An oligopoly where each firm acts independently tends toward equilibrium at the ideal, but such covert cooperation as price leadership tends toward higher profitability for all, though it is an unstable arrangement. There exist two types of price leadership. [14] In dominant firm price leadership, the price leader is the biggest firm.

  9. Monopoly - Wikipedia

    en.wikipedia.org/wiki/Monopoly

    Likewise, a monopoly should be distinguished from a cartel (a form of oligopoly), in which several providers act together to coordinate services, prices or sale of goods. Monopolies, monopsonies and oligopolies are all situations in which one or a few entities have market power and therefore interact with their customers (monopoly or oligopoly ...