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In economics, the business sector or corporate sector is "the part of the economy made up by companies". It is a subset of the domestic economy, excluding the economic activities of general government, private households, and nonprofit organizations serving individuals. The three main business sectors are the primary sector (raw materials), the secondary sector (manufacturing) and the tertiary sector (sales and services). In the United States the business sector accounted for about 78 percent of the value of gross domestic product (GDP) in 2000.