Q.Read the following statements: Assertion (A) and Reason (R). Choose the correct alternative from those given below: Assertion (A): The equilibrium level of income is determined, when ex-ante spending and ex-ante output are equal. Reason (R): The equilibrium level of income may or may not be the same as the full employment level of output. Alternatives: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

In the Keynesian model, the equilibrium level of income is indeed determined when ex-ante (planned) aggregate spending (Aggregate Demand) equals ex-ante (planned) aggregate output (Aggregate Supply). This is the fundamental condition for macroeconomic equilibrium, where there are no unintended inventory changes, and firms have no incentive to change their output levels. Thus, Assertion (A) is true.

Reason (R) states that the equilibrium level of income may or may not be the same as the full employment level of output. This is also true. Keynesian theory posits that an economy can be in equilibrium at a level of output below full employment (underemployment equilibrium) or even above full employment (inflationary gap), as there is no automatic mechanism to ensure that equilibrium output coincides with full employment output. …

In macroeconomics, particularly within the Keynesian framework, the equilibrium level of income in an economy is a crucial concept. It represents a state where there is no inherent tendency for the level of output and income to change. This equilibrium is achieved when the total amount of goods and services that firms plan to produce (ex-ante output) is exactly equal to the total amount of goods and services that households, firms, and the government plan to purchase (ex-ante spending).

Let's break down the Assertion and Reason:

Evaluating Assertion (A)

Assertion (A): The equilibrium level of income is determined, when ex-ante spending and ex-ante output are equal.

• Ex-ante spending refers to planned aggregate expenditure, which is the sum of planned consumption (C), planned investment (I), planned government spending (G), and planned net exports (X-M). This is also known as Aggregate Demand (AD).
• Ex-ante output refers to planned aggregate supply, which is the total value of goods and services that producers in an economy are willing to supply at different levels of income. In a simple two-sector model, this is equivalent to national income (Y) or Aggregate Supply (AS).

When planned spending (AD) equals planned output (AS), there are no unintended changes in inventories. If AD exceeds AS, inventories will fall below desired levels, prompting producers to increase output, which in turn increases income and employment. Conversely, if AD falls short of AS, inventories will accumulate, leading producers to cut back on production, causing income and employment to fall. The economy will only settle at an equilibrium where planned spending perfectly matches planned output. Therefore, Assertion (A) is True.

Evaluating Reason (R)

Reason (R): The equilibrium level of income may or may not be the same as the full employment level of output.

• Full employment level of output refers to the maximum sustainable output an economy can produce when all its available resources (labor, capital, land, entrepreneurship) are fully and efficiently utilized. This is often referred to as the economy's potential output.
• Equilibrium level of income, as discussed above, is determined by the intersection of AD and AS. …