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Assumptions of Spare Capacity and Fixed Wages in the Multiplier Model

The multiplier model's ability to translate increased spending into higher real output hinges on two key assumptions: the existence of spare capacity and fixed wages. These conditions ensure that firms' production costs do not rise as they expand output, enabling them to meet higher aggregate demand by increasing supply without adjusting their prices. If these conditions are not met, an increase in spending would instead lead to higher prices and wages, rather than a significant rise in real output.

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Updated 2025-10-04

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