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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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LONG-RUN AGGREGATE SUPPLY

The total (or aggregate) real production of final goods and services available in the domestic economy at a range of price levels, during a period of time in which all prices, especially wages, are flexible, and have achieved their equilibrium levels. Long-run aggregate supply, commonly abbreviated LRAS, is one of two aggregate supply alternatives, distinguished by the degree of price flexibility. The other is short-run aggregate supply. Long-run aggregate supply is combined with aggregate demand, and often short-run aggregate supply, in the long-run aggregate market (or AS-AD) analysis used to analyze economic growth, business-cycle instability, unemployment, inflation, government stabilization policies, and related macroeconomic topics.

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