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MARGINAL COST CURVE: A curve that graphically represents the relation between marginal cost incurred by a firm in the short-run product of a good or service and the quantity of output produced. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables, like technology and resource prices, constant. The marginal cost curve is U-shaped. Marginal cost is relatively high at small quantities of output, then as production increases, declines, reaches a minimum value, then rises. This shape of the marginal cost curve is directly attributable to increasing, then decreasing marginal returns (and the law of diminishing marginal returns).

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PROPRIETORS' INCOME

The official factor payment item in the National Income and Product Accounts maintained by the Bureau of Economics Analysis measuring the combined payments for all four factors of production used in owner-operated business firms. Specifically, proprietors' income is the excess of revenue over explicit production cost of owner-operated businesses and includes payments for labor, capital, land, and entrepreneurship. This is one of five official factor payments making up national income. The other four are compensation of employees, rental income of persons, net interest, and corporate profits. Proprietors' income is usually less than 10 percent of national income, typically in the 7 to 10 percent range.

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