Economic Definition of horizontal merger. Defined.
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Term horizontal merger Definition: The consolidation under a single ownership of two separately-owned businesses in the same industry. An example of a horizontal merger would be two soft drink companies merging to form a single firm. A horizontal merger should be contrasted with vertical merger--two firms in different stages of the production of one good, such that the output of one business is the input of the other; and conglomerate merger--two firms in totally, completely separate industries.