Overview
A business sector (企業, kigyō) or corporate sector - sometimes popularly called simply "business" - is "the part of the economy made up by companies" (from Wikipedia).
In other words, an organization or group that engages in economic activities for the purpose of making money or for some other purpose is called a corporation.
Related Articles
Industry Corporation Association Group Business Share Company
External Links
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Japanese
企業とは (キギョウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)