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April 17, 2024 

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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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MONOPOLISTIC COMPETITION: A market structure characterized by a large number of small firms, similar but not identical products sold by all firms, relative freedom of entry into and exit out of the industry, and extensive knowledge of prices and technology. This is one of four basic market structures. The other three are perfect competition, monopoly, and oligopoly. Monopolistic competition approximates most of the characteristics of perfect competition, but falls short of reaching the ideal benchmark that is perfect competition. In fact, the best way to think of monopolistic competition is our imperfect real world's best approximation of perfect competition. It aspires to perfect competition, but doesn't quite make it.

     See also | market structure | perfect competition | oligopoly | monopoly | market control | price maker | marginal cost | demand curve | market failure | monopolistic competition characteristics | monopolistic competition and demand | monopolistic competition and efficiency | inefficiency | product differentiation | competition among the many |


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MONOPOLISTIC COMPETITION, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2024. [Accessed: April 17, 2024].


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CLOSED ECONOMY

An economy that does not engage in international trade or other forms of interaction with other countries. That is, a closed economy neither exports goods and services to, nor imports goods and services from, other economies that make up its foreign sector. It is "closed" to the flow of goods and services into or out of the country. The alternative to a closed economy is an open economy, one that does engage in international trade.

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