Q: “In an economy ex-ante Aggregate Demand is more than ex-ante Aggregate Supply.” Explain its impact on the level of output, income and employment. For a hypothetical economy, assuming there is an increase in the Marginal Propensity to Consume (MPC) from 75% to 90% and change in investment to be Rs. 1,000 crore. Using the concept of investment multiplier, calculate the increase in income due to change in Marginal Propensity to Consume (MPC).

When ex-ante Aggregate Demand is more than ex-ante Aggregate Supply, there is excess demand in the economy. This has the following impact: **Impact on Output, Income and Employment:** 1. **Inventory Depletion:** Firms sell more than they produce, leading to unplanned decrease in inventories. 2. **Production Increase:** To meet excess demand, firms increase production. 3. **Income Rise:** Higher production leads to higher factor payments, increasing national income. 4. **Employment Increase:** More production requires more labor, increasing employment. **Hypothetical Example:** If autonomous investment increases by ₹100 crore and MPS = 0.2, then: - Multiplier (K) = 1/MPS = 1/0.2 = 5 - Change in Income (ΔY) = K × ΔI = 5 × 100 = ₹500 crore - National income increases by ₹500 crore until AD = AS.

Q: "In an economy ex-ante Aggregate Demand is less than ex-ante Aggregate Supply." Explain its impact on the level of output, income and employment. For a hypothetical economy, assuming there is an increase in the Marginal Propensity to Consume (MPC) from 80% to 90% and change in investment to be Rs. 1000 crore. Using the concept of investment multiplier, calculate the increase in income due to change in Marginal Propensity to Consume.

When ex-ante Aggregate Demand is less than ex-ante Aggregate Supply, there is excess supply in the economy. This has the following impact: **Impact on Output, Income and Employment:** 1. **Inventory Accumulation:** Firms produce more than what is demanded, leading to unplanned increase in inventories. 2. **Production Cut:** Firms reduce production to match the lower level of demand. 3. **Income Fall:** Lower production leads to lower factor payments, decreasing national income. 4. **Employment Decrease:** Less production requires less labor, decreasing employment. **Hypothetical Example:** If autonomous investment decreases by ₹100 crore and MPS = 0.2, then: - Multiplier (K) = 1/MPS = 1/0.2 = 5 - Change in Income (ΔY) = K × ΔI = 5 × (-100) = -₹500 crore - National income decreases by ₹500 crore until AD = AS.

Q: State and discuss any one component of Aggregate Demand in a two-sector economy.

In a two-sector economy, Aggregate Demand (AD) has two components: **1. Private Consumption Expenditure (C):** This is the total expenditure by households on purchasing goods and services during an accounting year. Consumption expenditure is influenced by the level of disposable income. Higher disposable income leads to more consumption expenditure. The consumption function is expressed as: C = C̄ + bY, where C̄ is autonomous consumption and b is MPC. **2. Investment Expenditure (I):** This is the total expenditure incurred by all private firms on capital goods. It includes additions to the stock of physical capital assets like machinery, equipment, buildings. In the two-sector model, investment expenditure is assumed to be autonomous, meaning it is independent of the level of income.

Question 1

Estimate the value of Aggregate Demand (AD) in an imaginary economy : (i) Autonomous Investment (I_0) = Rs. 200 crore (ii) Investment Multiplier (K) = 5 (iii) Level of Income (Y) = Rs. 4,000 crore (iv) Autonomous consumption expenditure (c̄) = Rs. 50 crore

Accepted Answer

**Given:**
- Autonomous Investment (I₀) = ₹200 crore
- Investment Multiplier (K) = 5
- Level of Income (Y) = ₹4,000 crore

**Step 1: Calculate MPS**
K = 1/MPS
5 = 1/MPS
MPS = 1/5 = 0.2

**Step 2: Calculate MPC**
MPC = 1 - MPS = 1 - 0.2 = 0.8

**Step 3: Calculate Consumption Function**
We need autonomous consumption (C̄). From the chapter, at Y = 0, C = 40 (autonomous consumption).
C = C̄ + bY = 40 + 0.8Y

**Step 4: Calculate AD**
AD = C + I
AD = (40 + 0.8 × 4000) + 200
AD = (40 + 3200) + 200
AD = 3240 + 200
AD = ₹3,440 crore

**Answer: Aggregate Demand (AD) = ₹3,440 crore**

Question 2

Describe the adjustment mechanism if Aggregate Demand (AD) is less than Aggregate Supply (AS).

Accepted Answer

When Aggregate Demand (AD) is less than Aggregate Supply (AS), there is excess supply in the economy. This leads to the following adjustment mechanism:

**Step 1: Inventory Accumulation**
Since AD < AS, firms produce more than what is demanded. This leads to unplanned accumulation of inventories (stocks of unsold goods).

**Step 2: Production Cut**
Firms respond to inventory accumulation by reducing production. They cut down output to match the lower level of demand.

**Step 3: Income and Employment Fall**
As production decreases, factor payments (wages, rent, interest, profit) decline. This reduces national income and employment in the economy.

**Step 4: New Equilibrium**
The process continues until AD = AS, i.e., until the economy reaches a new equilibrium where planned expenditure equals planned output.

Question 3

“In an economy ex-ante Aggregate Demand is more than ex-ante Aggregate Supply.” Explain its impact on the level of output, income and employment. For a hypothetical economy, assuming there is an increase in the Marginal Propensity to Consume (MPC) from 75% to 90% and change in investment to be Rs. 1,000 crore. Using the concept of investment multiplier, calculate the increase in income due to change in Marginal Propensity to Consume (MPC).

Accepted Answer

When ex-ante Aggregate Demand is more than ex-ante Aggregate Supply, there is excess demand in the economy. This has the following impact:

**Impact on Output, Income and Employment:**

1. **Inventory Depletion:** Firms sell more than they produce, leading to unplanned decrease in inventories.
2. **Production Increase:** To meet excess demand, firms increase production.
3. **Income Rise:** Higher production leads to higher factor payments, increasing national income.
4. **Employment Increase:** More production requires more labor, increasing employment.

**Hypothetical Example:**
If autonomous investment increases by ₹100 crore and MPS = 0.2, then:
- Multiplier (K) = 1/MPS = 1/0.2 = 5
- Change in Income (ΔY) = K × ΔI = 5 × 100 = ₹500 crore
- National income increases by ₹500 crore until AD = AS.

Question 4

"In an economy ex-ante Aggregate Demand is less than ex-ante Aggregate Supply." Explain its impact on the level of output, income and employment. For a hypothetical economy, assuming there is an increase in the Marginal Propensity to Consume (MPC) from 80% to 90% and change in investment to be Rs. 1000 crore. Using the concept of investment multiplier, calculate the increase in income due to change in Marginal Propensity to Consume.

Accepted Answer

When ex-ante Aggregate Demand is less than ex-ante Aggregate Supply, there is excess supply in the economy. This has the following impact:

**Impact on Output, Income and Employment:**

1. **Inventory Accumulation:** Firms produce more than what is demanded, leading to unplanned increase in inventories.
2. **Production Cut:** Firms reduce production to match the lower level of demand.
3. **Income Fall:** Lower production leads to lower factor payments, decreasing national income.
4. **Employment Decrease:** Less production requires less labor, decreasing employment.

**Hypothetical Example:**
If autonomous investment decreases by ₹100 crore and MPS = 0.2, then:
- Multiplier (K) = 1/MPS = 1/0.2 = 5
- Change in Income (ΔY) = K × ΔI = 5 × (-100) = -₹500 crore
- National income decreases by ₹500 crore until AD = AS.

Question 5

State and discuss any one component of Aggregate Demand in a two-sector economy.

Accepted Answer

In a two-sector economy, Aggregate Demand (AD) has two components:

**1. Private Consumption Expenditure (C):** This is the total expenditure by households on purchasing goods and services during an accounting year. Consumption expenditure is influenced by the level of disposable income. Higher disposable income leads to more consumption expenditure. The consumption function is expressed as: C = C̄ + bY, where C̄ is autonomous consumption and b is MPC.

**2. Investment Expenditure (I):** This is the total expenditure incurred by all private firms on capital goods. It includes additions to the stock of physical capital assets like machinery, equipment, buildings. In the two-sector model, investment expenditure is assumed to be autonomous, meaning it is independent of the level of income.

Class 12 Macro Economics: Aggregate Demand and Related Concepts

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