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June 14, 2025 

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NI: The abbreviation for national income, which is the total income earned by the citizens of the national economy as a result of their ownership of resources used in the production of final goods and services during a given period of time, usually one year. This is the government's official measure of how much income is generated by the economy. National income, generally abbreviated as NI, is the broadest, most comprehensive of three income measures reported quarterly (every three months) in the National Income and Product Accounts by the Bureau of Economic Analysis.

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PERFECT COMPETITION AND SHORT-RUN SUPPLY CURVE: A perfectly competitive firm's supply curve is that portion of its' marginal cost curve that lies above the minimum of the average variable cost curve. A perfectly competitive firm maximizes profit by producing the quantity of output that equates price and marginal cost. As such, the firm moves along it's marginal cost curve in response to alternative prices. Because the marginal cost curve is positively sloped due to the law of diminishing marginal returns, the firm's supply curve is also positively sloped.

     See also | perfect competition | supply curve | short run | law of supply | marginal cost | marginal cost curve | average variable cost | average variable cost curve | law of diminishing marginal returns | monopoly and perfect competition | perfect competition and demand | perfect competition and efficiency | perfect competition characteristics |


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SHORT RUN, MICROECONOMICS

In terms of the microeconomic analysis of production and supply, a period of time in which at least one input under the control of a firm used in the production process is variable and at least one input is fixed. In the short run, the variable input is usually labor and the fixed input is capital. The short-run analysis of production reveals the law of diminishing marginal returns and provides an understanding of the upward-sloping supply curve and the law of supply. This is one of four production time periods used in the study of microeconomics. The other three are long run, very long run, and very short run (or market period). The short run is also a time period designation used in the macroeconomic analysis of business cycles.

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