Macroeconomics Principles and Keynesian Analysis

Investment and Income in the Keynesian Model

Question 1: Graphically show that an increase in investment in the economy results in a proportionate increase in income in the simple Keynesian model.

Answer: In the simple Keynesian model, national income is determined by aggregate expenditure. Assume a closed economy with no government and no foreign trade.

Equilibrium condition: Y = C + I.

Let C = a + bY. When autonomous investment rises by ΔI, aggregate expenditure rises. Producers increase output and income. Higher income creates further consumption, which causes another increase in income. This continues in successive rounds.

Investment multiplier:
K = 1 / (1 − MPC) = 1 / MPS
Therefore, ΔY = K × ΔI.

Example: If MPC = 0.8, K = 5. If investment rises by ₹100 crore, final income rises by ₹500 crore.

The graph uses the 45° line and aggregate expenditure line. An increase in investment shifts the AE line upward, and equilibrium income moves from Y₁ to Y₂. Therefore, a small initial rise in investment creates a multiple rise in national income.

Factors Influencing Consumption Expenditure

Question 2: What are the factors that can influence consumption expenditure in an economy?

Answer: Consumption expenditure means household spending on goods and services. Current disposable income is the main factor, but several other factors also influence it:

• Disposable income: Higher disposable income generally increases consumption.
• Distribution of income: A change in income distribution can change total consumption because different income groups have different spending patterns.
• Wealth: Higher wealth, such as savings and property, can increase the ability to spend.
• Interest rate: Interest rates influence saving, borrowing, and spending decisions.
• Expectations: Expected future income or fear of unemployment can change present spending.
• Taxation: Higher direct taxes reduce disposable income and may reduce consumption.
• Price level: Changes in prices affect the real purchasing power of income.
• Credit availability: Easy loans can increase spending on durable goods such as houses and vehicles.
• Habits and social factors: Lifestyle, customs, and preferences affect consumption.
• Government policy: Taxes, transfers, and other policies can change disposable income and spending.

Money Supply and Bank Credit Creation

Question 3: Explain the concept of money supply and detail the process of credit creation by commercial banks.

Answer: Money supply is the total quantity of money available with the public at a particular point of time. It includes currency with the public and different bank deposits depending on the measure used.

Credit creation: Commercial banks accept deposits and keep a fraction as reserves. The remaining amount is lent to borrowers. When loans are deposited back into banks, they create further deposits and loans. This process continues and creates multiple deposits.

Example: Initial deposit = ₹1,000 and reserve ratio = 20%.

• Reserve = ₹200; first loan = ₹800.
• The ₹800 may become a new deposit. The next bank keeps ₹160 and lends ₹640. Further rounds continue in smaller amounts.

Deposit multiplier = 1 / Reserve Ratio.
At 20%, multiplier = 1 / 0.20 = 5. Under simple assumptions, ₹1,000 can support total deposits up to ₹5,000.

In real life, credit creation is limited by reserve requirements, cash withdrawals, demand for loans, banks’ willingness to lend, and central bank rules.

Central Bank Instruments for Credit Control

Question 4: Role of the Central Bank in Controlling Credit and Money Supply through Quantitative and Qualitative Instruments.

Answer: The central bank controls the volume and cost of credit to maintain price stability, economic growth, and financial stability. Its instruments are broadly quantitative and qualitative.

A. Quantitative Instruments

• Policy interest rates / Bank Rate: Changes in policy rates influence borrowing and lending rates.
• Open Market Operations: Buying securities injects liquidity; selling securities absorbs liquidity.
• CRR (Cash Reserve Ratio): A higher CRR reduces banks’ lendable funds; a lower CRR increases them.
• SLR (Statutory Liquidity Ratio): Changes in required liquid assets affect banks’ lending capacity.

B. Qualitative or Selective Instruments

• Margin requirements: Changes in the margin can control credit for particular purposes.
• Credit rationing: Limits may be placed on the amount of credit for selected activities.
• Moral suasion: The central bank persuades banks to follow desired lending policies.
• Selective credit control: Credit conditions can be tightened for specific sectors when necessary.

Thus, the central bank can expand credit during weak economic conditions and restrict excessive credit growth during inflationary periods.

Solving the Double Counting Problem

Question 5: Double Counting Problem and How It Can Be Avoided by the Value-Added Method.

Answer: Double counting means counting the value of the same good or service more than once while calculating national income. It occurs when the value of intermediate goods is added along with the value of final goods.

Example: A farmer sells wheat for ₹100 to a flour mill. The mill sells flour for ₹150 to a bakery. The bakery sells bread for ₹200 to consumers. If we add ₹100 + ₹150 + ₹200 = ₹450, the value of wheat and flour is counted again inside the final price of bread. GDP is therefore overstated.

Ways to avoid double counting:

1. Final goods method: Count only goods and services sold for final use, not intermediate goods.
2. Value-added method: Count only the additional value created at each stage.

For the example:
Farmer’s value added = ₹100
Mill’s value added = ₹150 − ₹100 = ₹50
Bakery’s value added = ₹200 − ₹150 = ₹50
Total value added = ₹100 + ₹50 + ₹50 = ₹200.

This equals the final value of bread. Hence, the value-added method avoids double counting because only newly created value at each stage is included.

Understanding Government Deficits

Question 6: Revenue Deficit, Fiscal Deficit, and Primary Deficit.

Answer:

• Revenue Deficit: Excess of revenue expenditure over revenue receipts.
  Revenue Deficit = Revenue Expenditure − Revenue Receipts.
• Fiscal Deficit: The government’s overall borrowing requirement. It is the excess of total expenditure over total receipts excluding borrowings.
  Fiscal Deficit = Total Expenditure − (Revenue Receipts + Non-debt Capital Receipts).
• Primary Deficit: Fiscal deficit after excluding interest payments on past debt.
  Primary Deficit = Fiscal Deficit − Interest Payments.

In short, revenue deficit focuses on the revenue account; fiscal deficit shows overall borrowing need; primary deficit shows the deficit excluding interest burden.

Inflationary Gaps and Expenditure Multipliers

Question 5 (Continued): Inflationary Gap, Deflationary Gap, and Government Expenditure Multiplier.

Answer: Inflationary gap is the excess of aggregate demand over the level required for full-employment equilibrium. It creates upward pressure on prices. Deflationary gap is the shortage of aggregate demand below the level required for full employment. It may cause unemployment and lower output.

In the simple Keynesian model: Y = C + I + G. If C = a + bY, then Y = [1 / (1 − b)](a + I + G).

So the government expenditure multiplier is: KG = ΔY / ΔG = 1 / (1 − MPC) = 1 / MPS.

Key Macroeconomic Definitions

12. Intermediate Goods: Goods used as inputs to produce other goods and services, not for final use. Example: Flour used by a bakery to make bread.

13. Cash Reserve Ratio (CRR): The percentage of a commercial bank’s deposits that it must keep as cash reserves with the central bank.

14. Two Functions of Money:
1. Medium of exchange: Used for buying and selling goods.
2. Measure of value: Provides a common unit for expressing prices.

15. Investment Multiplier Problems:
K = 1 / (1 − MPC). If MPC = 0.8, K = 5. If K = 4, MPC = 0.75.

16. GDP and GNP Calculations:
GNP = GDP + NFIA. If GDP = ₹500 crore and NFIA = ₹20 crore, GNP = ₹520 crore.

17. GDP Deflator: A price index measuring overall price changes. GDP Deflator = (Nominal GDP / Real GDP) × 100.

Consumption and Saving Functions

Question 1: Consumption Function and Derivation of Saving Function.

Answer: The consumption function shows the relationship between consumption expenditure and income: C = a + bY, where a = autonomous consumption and b = MPC.

Saving is the part of income not spent: S = Y − C. Substituting C, we get S = −a + (1 − b)Y. Since (1 − b) = MPS, the saving function is S = −a + MPS · Y. The saving function is upward sloping. At low income, saving may be negative (dissaving); at break-even income, saving is zero.

Comparing APC and MPC

Question 2: APC and showing that APC is always greater than MPC in Keynesian Consumption Function.

Answer: APC is the proportion of income spent on consumption: APC = C / Y. In the Keynesian function, C = a + bY, so APC = a/Y + b. Since MPC = b, then APC − MPC = a/Y. Because a > 0 and Y > 0, APC is always greater than MPC. As income rises, a/Y falls, and APC approaches MPC.

Demand-Pull vs Cost-Push Inflation

Question 3: Distinguishing between Demand-Pull and Cost-Push Inflation.

Answer: Demand-pull inflation occurs when aggregate demand rises faster than the economy’s capacity. Cost-push inflation occurs when production costs (wages, fuel) rise, forcing producers to increase prices.

• Cause: Demand-pull = excess demand; Cost-push = higher costs.
• Output: Demand-pull may raise output; cost-push may reduce it.
• Example: Sudden rise in spending vs. rise in oil prices.

Measures of Money Supply in India

Question 4: Different Measures of Money Supply: M1, M2, M3, and M4.

Answer:

• M1: Currency with public + Demand deposits + Other deposits with RBI.
• M2: M1 + Savings deposits with post office savings banks.
• M3: M1 + Time deposits with commercial banks (Broad Money).
• M4: M3 + Total post office deposits.

Core Macroeconomic Terms and Policies

1. Scope of Macroeconomics: Studies the economy as a whole, including national income, employment, and growth.

2. NDP and NNP: NDP = GDP − Depreciation. NNP = GNP − Depreciation.

3. Per Capita Income: National Income ÷ Total Population.

4. MPC: ΔC / ΔY. Measures the change in consumption per unit change in income.

5. APC: C / Y. The proportion of total income used for consumption.

6. Fiscal and Monetary Policy: Fiscal policy involves government spending/taxes; Monetary policy involves central bank money supply/interest rates.

7. Tax Multiplier: −MPC / (1 − MPC). Shows income change relative to tax changes.

8. Demand-Pull Inflation: Occurs when too much spending chases too few goods.

9. Speculative Demand for Money: Holding money as an asset based on interest rate expectations.

10. Balanced Budget Multiplier: In the simple Keynesian model, its value is 1.

11. High-Powered Money: Currency held by the public plus bank reserves with the central bank.