| Accounting-profit rate | a measure of a business's profitability, calculated as its accounting profit divided by owner's equity
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| Average-cost pricing | the practice of setting price where it equals average cost
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| Cartel | a union of oligopolists who have a formal market-sharing agreement
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| Collusion | oligopolists acting together as if they are a monopoly
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| Concentration ratio | the percentage of total sales revenue earned by the largest businesses in a market
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| Conglomerate merger | A combination of businesses in unrelated industries.
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| Fair rate of return | the maximum accounting-profit rate allowed for a regulated monopoly
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| Horizontal merger | A combination of former rivals.
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| Industrial concentration | market domination by one or a few large businesses
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| Kinked demand curve | a demand curve with two segments, one fairly flat and one steep, that is typical of rival oligopolists
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| Market share | a business's proportion of total market sales
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| Mutual interdependence | the relationship between oligopolists, in which the actions of each business affect the other businesses
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| Nonprice competition | efforts to increase demand through product differentiation, advertising, or both
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| Price leadership | an understanding among oligopolists that one business will initiate all price changes in the market and the others will follow by adjusting their prices and output accordingly
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| Product differentiation | efforts to make a product distinct from that of competitors
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| Vertical merger | A combination of a business and its supplier.
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2002 McGraw-Hill Higher Education