Introduction
The determination of output and employment is one of the most important topics in Macroeconomics for the UGC NET Economics examination. It explains how the level of national income, output, and employment are determined in an economy.
Two major approaches explain the determination of output and employment:
- Classical Theory
- Keynesian Theory
The Classical economists believed that the economy automatically moves towards full employment through market forces. On the other hand, the Keynesian economists argued that economies can remain in underemployment equilibrium for a long period and government intervention becomes necessary.
This topic is extremely important for:
- UGC NET Economics
- MA Economics
- University examinations
- Competitive examinations
1. Classical Theory of Output and Employment
Introduction to Classical Theory
The Classical Theory was developed by economists such as:
- “Adam Smith“,”Scottish Economist”
- “David Ricardo“,”British Economist”
- “J. B. Say“,”French Economist”
- “Alfred Marshall“,”British Economist”
- “A. C. Pigou“,”British Economist”
The classical economists believed that a free market economy automatically achieves full employment equilibrium through flexibility in wages, prices, and interest rates.
2. Main Features of Classical Theory
1. Full Employment Assumption
Classical economists assumed that the economy normally operates at full employment.
According to them:
- Unemployment is temporary.
- Any unemployment is voluntary.
- Market forces automatically restore full employment.
2. Perfect Competition
The classical model assumes perfect competition in:
- Goods market
- Labour market
- Capital market
Therefore:
- Prices are flexible.
- Wages are flexible.
- Interest rates are flexible.
3. Say’s Law of Markets
One of the most important principles of Classical economics is Say’s Law.
It was given by:
“J. B. Say”,
Statement
“Supply creates its own demand.”
Meaning:
Whenever goods are produced, income is generated equal to the value of output. This income creates demand for goods.
Thus:
- General overproduction is impossible.
- Deficiency of aggregate demand cannot occur.
- Full employment is automatically maintained.
3. Classical Labour Market
According to classical economists, employment is determined in the labour market through:
- Demand for labour
- Supply of labour
Demand for Labour
Labour demand depends on Marginal Productivity of Labour (MPL).
Firms hire labour until:
W = MPL
Where:
- W = Wage rate
- MPL = Marginal Product of Labour
The labour demand curve slopes downward because marginal productivity declines as more labour is employed.
Supply of Labour
Supply of labour depends on real wages.
Higher wages encourage more workers to supply labour.
Thus, labour supply curve slopes upward.
Equilibrium in Labour Market
Equilibrium occurs where:
Labour Demand = Labour Supply
At equilibrium:
- Full employment is achieved.
- Wage rate becomes stable.
4. Classical Theory of Interest Rate
According to classical economists, interest rate is determined by:
- Saving
- Investment
Saving Function
Saving is positively related to interest rate.
Higher interest rates encourage more saving.
Investment Function
Investment is negatively related to interest rate.
Higher interest rates discourage investment.
Equilibrium Interest Rate
Equilibrium occurs where:
S = I
Where:
- S = Saving
- I = Investment
Thus, interest rate adjusts automatically to maintain equality between saving and investment.
5. Quantity Theory of Money
Classical economists believed that money only affects price level and not real output.
Money is neutral.
The Quantity Theory of Money is expressed as:
MV = PT
Where:
- M = Money Supply
- V = Velocity of Money
- P = Price Level
- T = Volume of Transactions
According to classical economists:
- Increase in money supply increases prices proportionately.
- Output and employment remain unaffected.
6. Assumptions of Classical Theory
- Full employment exists.
- Prices and wages are flexible.
- Perfect competition exists.
- No government intervention.
- Savings automatically become investment.
- Money is neutral.
- Markets clear automatically.
7. Criticisms of Classical Theory
1. Unrealistic Full Employment Assumption
In reality, unemployment exists for long periods.
2. Wages Are Not Perfectly Flexible
Trade unions and labour laws prevent wage flexibility.
3. Say’s Law Fails During Depression
During the Great Depression, demand deficiency caused massive unemployment.
4. Saving and Investment Are Not Always Equal
Savings and investment decisions are made by different groups.
5. Ignored Aggregate Demand
Classical economists neglected the role of aggregate demand.
8. Keynesian Theory of Output and Employment
Introduction
The Keynesian Theory was developed by:
“people”,”John Maynard Keynes”,”British Economist”
in his famous book:
“The General Theory of Employment, Interest and Money”,”1936″
Keynes developed his theory during the Great Depression of the 1930s.
He criticized classical economics and argued that economies may remain in underemployment equilibrium due to deficiency of aggregate demand.
9. Main Features of Keynesian Theory
1. Underemployment Equilibrium
Keynes argued that full employment is not automatic.
Economy can remain in equilibrium even with unemployment.
2. Importance of Aggregate Demand
Output and employment depend on Aggregate Demand (AD).
Higher AD leads to:
- Higher output
- Higher income
- Higher employment
3. Wage Rigidity
Wages are sticky downward.
Workers resist wage cuts.
4. Government Intervention
Government intervention becomes necessary during recession.
10. Aggregate Demand (AD)
Meaning
Aggregate Demand refers to total demand for goods and services in an economy during a given period.
Components of AD
AD = C + I
Where:
- C = Consumption Expenditure
- I = Investment Expenditure
In a three-sector economy:
AD = C + I + G
In a four-sector economy:
AD = C + I + G + (X – M)
11. Aggregate Supply (AS)
Meaning
Aggregate Supply refers to total output produced in an economy.
In the Keynesian short-run model:
- AS is perfectly elastic before full employment.
- AS becomes perfectly inelastic at full employment.
12. Keynesian Equilibrium
Equilibrium Condition
Equilibrium occurs where:
AD = AS
or
Y = AD
Where:
- Y = National Income
- AD = Aggregate Demand
At equilibrium:
- Planned expenditure equals output.
- Firms have no incentive to change production.
13. Consumption Function
Meaning
Consumption function shows relationship between consumption and income.
Formula
C = a + bY
Where:
- C = Consumption
- a = Autonomous Consumption
- b = Marginal Propensity to Consume (MPC)
- Y = Income
Autonomous Consumption
Consumption that occurs even at zero income.
Marginal Propensity to Consume (MPC)
MPC measures the proportion of additional income spent on consumption.
Formula:
MPC = Change in Consumption / Change in Income
0 < MPC < 1
14. Saving Function
Meaning
Saving function shows relationship between saving and income.
Formula
S = -a + (1-b)Y
Where:
- S = Saving
- a = Autonomous Consumption
- b = MPC
Marginal Propensity to Save (MPS)
MPS measures proportion of additional income saved.
Formula:
MPS = Change in Saving / Change in Income
Relationship:
MPC + MPS = 1
15. Investment Function
Meaning
Investment refers to expenditure on capital goods.
According to Keynes:
Investment depends on:
- Marginal Efficiency of Capital (MEC)
- Interest Rate
Marginal Efficiency of Capital (MEC)
MEC refers to expected profitability of investment.
Investment occurs until:
MEC = Rate of Interest
16. Multiplier
Meaning
Multiplier refers to the ratio of change in income to change in investment.
It explains how small increase in investment leads to larger increase in national income.
Formula
K = Change in Income / Change in Investment
or
K = 1 / (1 – MPC)
Since:
MPS = 1 – MPC
Therefore:
K = 1 / MPS
Importance of Multiplier
- Explains income generation process.
- Helps in employment creation.
- Useful in fiscal policy.
- Important during depression.
17. Principle of Effective Demand
This is the central concept of Keynesian economics.
According to Keynes:
Employment depends on Effective Demand.
Effective Demand
Effective demand is the level of aggregate demand at which entrepreneurs maximize profits.
When AD increases:
- Output rises.
- Employment rises.
18. Comparison Between Classical and Keynesian Theory
| Basis | Classical Theory | Keynesian Theory |
|---|---|---|
| Employment | Full employment | Underemployment possible |
| Wage Flexibility | Flexible wages | Sticky wages |
| Say’s Law | Accepted | Rejected |
| Government Role | Minimal | Important |
| Money | Neutral | Non-neutral |
| Cause of Unemployment | Voluntary | Deficiency of demand |
| Equilibrium | Automatic | Requires intervention |
| Focus | Supply side | Demand side |
19. Importance of Keynesian Theory
- Explained Great Depression.
- Highlighted role of aggregate demand.
- Supported government intervention.
- Developed modern macroeconomics.
- Provided basis for fiscal policy.
20. Criticisms of Keynesian Theory
- Short-run analysis only.
- Ignored inflation in long run.
- Excessive government intervention may create deficits.
- Assumes excess capacity.
- Consumption function unstable in long run.
21. Important Formulas
Classical Theory
S = I
W = MPL
MV = PT
Keynesian Theory
AD = C + I
Y = AD
C = a + bY
S = -a + (1-b)Y
MPC = Change in Consumption / Change in Income
MPS = Change in Saving / Change in Income
K = 1 / (1-MPC)
K = 1 / MPS
22. Important UGC NET Exam Points
- Say’s Law states “Supply creates its own demand.”
- Classical economists believed in full employment.
- Keynes rejected Say’s Law.
- Aggregate demand determines employment in Keynesian theory.
- Keynesian equilibrium may occur below full employment.
- Multiplier depends on MPC.
- MPC + MPS = 1.
- Effective demand is central to Keynesian economics.
- Wages are flexible in classical theory.
- Wages are sticky in Keynesian theory.
Conclusion
The Classical and Keynesian approaches provide two different explanations of output and employment determination.
The Classical theory emphasizes:
- Market self-adjustment
- Full employment
- Flexible wages and prices
The Keynesian theory emphasizes:
- Aggregate demand
- Government intervention
- Underemployment equilibrium
For UGC NET Economics, students should focus on:
- Assumptions of both theories
- Say’s Law
- Effective demand
- Consumption and saving functions
- Multiplier
- Comparative analysis
- Important formulas and diagrams
A clear understanding of both approaches is essential for conceptual and numerical questions in the examination.