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November 15, 2025 

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DEMAND ELASTICITY AND TOTAL EXPENDITURE: The notion that price-induced changes in total expenditure for a good (price times quantity) depends on the relative price elasticity of demand. In particular, for relatively elastic demand (1 < E < ∞) changes in price cause total expenditure to change in the opposite direction. An increase in price causes total expenditure to fall and a decrease in price causes total expenditure to rise. For relatively inelastic demand (0 < E < 1) changes in price cause total expenditure to change in the same direction. An increase in price causes total expenditure to rise and a decrease in price causes total expenditure to fall. For unit elastic demand (E =1) price changes do not cause any change in total expenditure. Total expenditure is the same whether price increases or decreases.

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REGULATORY PRICING: Government control over the price charge in a market, especially by a firm with market control. Price regulation is most commonly used for public utilities characterized as natural monopolies. If allowed to maximize profit without restraint, the price charged would exceed marginal cost and production would be inefficient. However, because such firms, as public utilities, produce output that is deemed essential or critical for the public, government steps in to regulate or control the price. The two most common methods of price regulation are marginal-cost pricing and average-cost pricing.

     See also | government intervention | government | market | natural monopoly | public utility | marginal-cost pricing | average-cost pricing |


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WAGES, AGGREGATE SUPPLY DETERMINANT

One of several specific aggregate supply determinants assumed constant when the short-run aggregate supply curve is constructed, and that shifts the short-run aggregate supply curve when it changes. An increase in the wages causes a decrease (leftward shift) of the short-run aggregate supply curve. A decrease in the wages causes an increase (rightward shift) of the short-run aggregate supply curve. Other notable aggregate supply determinants include the technology, energy prices, and the capital stock. Wages are an example of a resource price aggregate supply determinant.

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