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June 14, 2025 

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MARGINAL REVENUE, PERFECT COMPETITION: The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a perfectly competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a perfectly competitive firm equates marginal revenue and marginal cost.

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DEMAND SHOCK: A disruption of market equilibrium (that is, a market adjustment) caused by a change in a demand determinant and a shift of the demand curve. A demand shock can take one of two forms--an Demand Increase or a Demand Decrease. An increase in demand is seen as a rightward shift of the demand curve and results in an increase in equilibrium quantity and an increase in equilibrium price. A decrease in demand is a leftward shift of the demand curve and results in a decrease in equilibrium quantity and a decrease in equilibrium price.

     See also | market equilibrium | market adjustment | demand | demand curve | demand price | demand determinant | equilibrium quantity | equilibrium price | equilibrium | income | normal good | inferior good | preferences | other prices | substitute-in-consumption | complement-in-consumption | buyers' expectations | number of buyers | demand decrease | demand increase | supply shock |


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SLOPE, SHORT-RUN AGGREGATE SUPPLY CURVE

The positive slope of the short-run aggregate supply curve, reflecting the direct relation between the price level and real production, results for three primary reasons--inflexible resources, frictional and structural unemployment, and purchasing power imbalances.

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