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Formally: monopoly power is controlling 25% of a market.

• dragonwriter 11y ago
  No, monopoly, market, or pricing power (the the terms are equivalent in anti trust law) exists when there is a range in which an entity can increase prices without losing sales to competitors. There is no percentage of market threshold. This definition reflects the economic concept of a monopoly in that the presence of this pricing power indicates the absence of a competitive market with perfect substitutes for the goods sold.