The long-run aggregate supply curve is vertical because

Question

BlackTom AI · Accepted Answer

The question asks why the long-run aggregate supply (LRAS) curve is vertical.
Option a: 'wages, prices, and interest rates are not flexible in the long run.' This is incorrect because, in the long run, many prices and wages, including interest rates, are flexible and adjust to equilibrate the economy. The lack of flexibility would not produce a vertical LRAS.
Option b: 'it incorporates the assumptions of Keynesian theory.' This is not accurate for the LRAS being vertical. Keynesian theory typically emphasizes price and wage stickiness in the short run, whereas the vertical LRAS aligns more with classical assumptions of flexible prices and full employment output in the long run.
Option c: 'the economy will gravitate to the position of full employment when all variables are flexible.' This statement captures the core idea: in the long run, with flexible prices and inputs, the economy operates at its potential output, i.e., full employment, making the LRAS vertical.
Option d: 'many inputs are fixed.' This describes short-run constraints rather than the long-run behavior. In the long run, inputs are variable, not fixed, so this would not explain a vertical LRAS.

The long-run aggregate supply curve is vertical because单项选择题

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Figure 33-5. Refer to Figure 33-5. The appearance of the long-run aggregate-supply (LRAS) curve

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