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Question

According to ______________________, equilibrium level of income and output in the economy is the one where the desired aggregate demand for goods and services is equal to aggregate supply.

A
aggregate demand-aggregate supply approach
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B
saving-investment approach
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C
income-output approach
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D
none of the above
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Solution

The correct option is D aggregate demand-aggregate supply approach
According to aggregate demand-aggregate supply approach, the equilibrium is reached only when aggregate demand (AD)is equals to aggregate supply (AS) because at this level there is no tendency for income and output to change.
In the diagram the equilibrium is at K where AD intersects 45 line. At this point, AD = AS.
When AD is more than AS (say, at point R), then the planned inventory would fall below the desired level. To bring back the Inventory at the desired level, the producers expand the output More output means more income. Rise in output means rise in AS and rise in income means rise in AD. Both continue to rise till they reach K, where AD = AS.
When AD is less than AS (say, at point S), then the planned inventory rises above the desired level. To clear the unwanted increase in inventory, firms plan to reduce the output till AD becomes equal to AS.
So, equilibrium takes place only at point K, when AD = AS

1270378_1018878_ans_73009f3189f14b16832b71ab078cf79e.png

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