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Characteristics of a Market Leader. A market leader is typically the company holding the largest market share in a particular industry or segment of an industry. Market leaders are often recognizable by the ubiquitous presence of their brand as well as their ongoing marketing efforts.
A market maker is a bank or brokerage company that stands ready every second of the trading day with a firm ask and bid price. This is good for you, because when you place a market order to sell your thousand shares of Disney, the market maker will actually purchase the stock from you, even if he doesn't have a seller lined up.