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July 18, 2025 

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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.

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SHORT-RUN PRODUCTION: An analysis of the production decision made by a firm in the short run, with the ultimate goal of explaining the law of supply and the upward-sloping supply curve. The central feature of this short-run analysis is the law of diminishing marginal returns, which results in the short run when larger amounts of a variable input, like labor, are added to a fixed input, like capital. This analysis of short-run production is but the first step in a brisk walk toward a better understanding of supply. Further steps include the cost of short-run production, especially marginal cost, and the market structure in which a firm operates, such as perfect competition or monopoly.

     See also | fixed input | variable input | law of diminishing marginal returns | marginal product | total product | average product | marginal cost | total variable cost | total cost | total fixed cost | profit maximization | total revenue and total cost | marginal revenue and marginal cost |


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BALANCE OF PAYMENTS

A comprehensive set of accounts that tracks the flow of currency and other monetary assets coming in to and going out of a nation. These payments are used for international trade, foreign investments, and other financial activities. The balance of payments is divided into two accounts -- current account (which includes payments for imports, exports, services, and transfers) and capital account (which includes payments for physical and financial assets). A deficit in one account is matched by a surplus in the other account. The balance of trade is only one part of the overall balance of payments set of accounts.

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