corporation whose asset growth, often very rapid, comes largely through the acquisition of, or merger with, other firms whose products are largely unrelated to each other or to that of the parent company. Merger to gain monopoly ("horizontal integration") was notable at the end of the 19th cent.; somewhat later, acquisition of suppliers or buyers ("vertical integration") became fairly common. Conglomerates did not emerge until the 1960s, when they quickly became popular among investors. Their stock prices often rose (and sometimes fell) spectacularly. Economic advantages attributed to the conglomerate include protection against overspecialization, availability of management expertise, and reduced costs. The rise of the conglomerate in the 20th cent. has been attributed to restrictions imposed by antitrust laws: As businesses were constrained within their own industry, they instead expanded into different markets. This trend greatly intensified during the 1980s and 1990s (see merger ); a notable exception was ITT, which split up (1995) its companies to strengthen operations.

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