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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.
Market participant. The term market participant is another term for economic agent, an actor and more specifically a decision maker in a model of some aspect of the economy. For example, buyers and sellers are two common types of agents in partial equilibrium models of a single market.