Written By: Ujjwal Matoliya
🔹 Unit 1: Introduction
1️⃣ What is Production Possibility Curve (PPC)?
Definition:
The Production Possibility Curve (PPC) is a graphical representation that shows the maximum possible combinations of two goods that an economy can produce with given resources and technology.
Key Points:
-
Resources are limited.
-
To produce more of one good, some quantity of the other good must be sacrificed.
-
This sacrifice is called Opportunity Cost.
-
PPC slopes downward from left to right.
-
It is usually concave to the origin due to increasing opportunity cost.
Assumptions:
-
Resources are fixed.
-
Technology remains constant.
-
Full employment of resources.
2️⃣ Difference between Positive Economics and Normative Economics
| Basis | Positive Economics | Normative Economics |
|---|---|---|
| Meaning | Deals with “what is” | Deals with “what ought to be” |
| Nature | Based on facts and data | Based on opinions and value judgments |
| Example | Inflation rate is 6% | Government should reduce inflation |
| Testability | Can be tested and verified | Cannot be tested scientifically |
3️⃣ Explain the Central Problems of an Economy (What, How, For Whom)
Due to scarcity of resources, every economy faces three central problems:
1. What to Produce?
The economy must decide:
-
Which goods to produce?
-
How much quantity to produce?
For example, whether to produce more consumer goods or capital goods.
2. How to Produce?
The economy must decide:
-
Which technique to use?
-
Labour-intensive technique
-
Capital-intensive technique
-
The choice depends on the availability of resources and cost efficiency.
3. For Whom to Produce?
The economy must decide:
-
How the goods and services will be distributed among people.
-
Who will get more and who will get less.
This depends on income distribution and purchasing power.
🔹 Unit 2: Consumer Behaviour
4️⃣ Explain the Law of Diminishing Marginal Utility
Definition:
The Law of Diminishing Marginal Utility states that as a consumer consumes more units of a good, the additional satisfaction (marginal utility) from each extra unit goes on decreasing.
Example:
If you eat slices of pizza:
-
1st slice → Very high satisfaction
-
2nd slice → Less satisfaction
-
3rd slice → Even less satisfaction
Eventually, marginal utility may become zero or negative.
Assumptions:
-
Consumption is continuous.
-
Units are identical.
-
Consumer is rational.
5️⃣ Factors Affecting Price Elasticity of Demand
-
Nature of the Good (necessity or luxury)
-
Availability of substitutes
-
Income level of consumers
-
Proportion of income spent
-
Time period
-
Habit-forming goods
6️⃣ Difference between Budget Line and Budget Set
| Basis | Budget Line | Budget Set |
|---|---|---|
| Meaning | Shows different combinations of two goods a consumer can buy with given income | Shows all possible combinations within income |
| Representation | Straight line | Area under the budget line |
| Income usage | Entire income is spent | Income may or may not be fully spent |
7️⃣ What are Complementary and Substitute Goods?
Complementary Goods
Goods that are used together.
Examples:
-
Tea and sugar
-
Car and petrol
-
Pen and ink
If the price of one increases, demand for the other decreases.
Substitute Goods
Goods that can replace each other.
Examples:
-
Tea and coffee
-
Pepsi and Coca-Cola
-
Butter and margarine
If the price of one increases, demand for the other increases.
8️⃣ What are Giffen Goods?
Definition:
Giffen goods are inferior goods for which demand increases when the price increases, and demand decreases when the price decreases.
This happens due to a strong income effect that outweighs the substitution effect.
Example:
In poor households, when the price of staple food (like rice) increases, people may buy more rice because they cannot afford better food.
🔹 Unit 3: Producer Behaviour & Supply
1️⃣ Three Stages of Law of Variable Proportions
-
Stage I – Increasing Returns
-
Total Product (TP) increases at increasing rate.
-
Marginal Product (MP) rises.
-
Better utilization of fixed factors.
-
-
Stage II – Diminishing Returns
-
TP increases at decreasing rate.
-
MP starts falling but remains positive.
-
This is the rational stage of production.
-
-
Stage III – Negative Returns
-
TP decreases.
-
MP becomes negative.
-
Overuse of variable factor.
-
2️⃣ Relationship between Average Cost (AC) and Marginal Cost (MC)
-
When MC < AC, AC falls.
-
When MC > AC, AC rises.
-
MC cuts AC at its minimum point.
3️⃣ Formula and Relationship between TP, AP and MP
Formulas:
-
AP = TP / Units of Variable Factor
-
MP = Change in TP / Change in Variable Factor
Relationship:
-
When MP > AP → AP rises
-
When MP < AP → AP falls
-
MP cuts AP at maximum point
4️⃣ Why are Cost Curves ‘U’ Shaped?
Cost curves are U-shaped because:
-
Initially, better utilization of resources reduces cost.
-
Later, law of diminishing returns increases cost.
5️⃣ Factors Affecting Elasticity of Supply
-
Time period
-
Availability of inputs
-
Mobility of factors
-
Nature of product
-
Level of stock
6️⃣ Law of Supply and its Exceptions
Law of Supply:
Other things being constant, quantity supplied increases with rise in price and decreases with fall in price.
Exceptions:
-
Agricultural products
-
Perishable goods
-
Future expectations
-
Rare goods
7️⃣ Reasons for Rightward Shift of Supply Curve
-
Decrease in cost of production
-
Improvement in technology
-
Decrease in taxes
-
Increase in number of firms
-
Favourable government policy
8️⃣ Six Factors Affecting Price Elasticity of Supply
-
Time period
-
Nature of product
-
Availability of factors
-
Mobility of factors
-
Cost of production
-
Level of stock
9️⃣ Difference between Contraction/Expansion and Increase/Decrease in Demand
-
Contraction/Expansion: Movement along the demand curve due to price change.
-
Increase/Decrease: Shift of demand curve due to factors other than price.
🔟 Difference between Demand and Need
-
Need: Desire for something.
-
Demand: Desire + ability + willingness to pay.
1️⃣1️⃣ Difference between Excess Demand and Deficient Demand
-
Excess Demand: Demand > Supply (Inflationary gap).
-
Deficient Demand: Demand < Supply (Deflationary gap).
1️⃣2️⃣ Types of Utility
-
Form Utility
-
Place Utility
-
Time Utility
-
Service Utility
1️⃣3️⃣ Any Three Determinants of Supply
-
Price of the good
-
Cost of production
-
Technology
1️⃣4️⃣ Features of Propensity to Consume
-
MPC + MPS = 1
-
MPC is always positive but less than 1
-
APC falls as income increases
1️⃣5️⃣ Difference between Substitute and Complementary Goods
-
Substitute: Can replace each other (Tea & Coffee).
-
Complementary: Used together (Car & Petrol).
1️⃣6️⃣ Applications of Law of Supply
-
Price determination
-
Agricultural pricing
-
Tax policy
-
Business production decisions
🔹 Unit 4: Theory of Firm (Perfect Competition)
1️⃣ Characteristics of Perfect Competition
Perfect competition is a market structure where there are a large number of buyers and sellers dealing in a homogeneous product. No single firm can influence the market price. The main characteristics are as follows:
First, there are many buyers and sellers, so individual firms have very small market share. Second, the product is homogeneous, meaning identical in quality and features. There is no product differentiation.
Third, there is free entry and exit of firms in the long run. Firms can enter when there are profits and exit when there are losses.
Fourth, there is perfect knowledge among buyers and sellers about prices and products.
Fifth, there is perfect mobility of factors of production. Resources can move freely from one use to another.
Sixth, firms are price takers, not price makers.
Under perfect competition, firms earn only normal profit in the long run due to free entry and exit.
2️⃣ Why is a Firm a Price Taker in Perfect Competition?
A firm is called a price taker when it cannot influence the market price and must accept the price determined by market forces of demand and supply.
In perfect competition, there are a large number of buyers and sellers. Each firm produces only a small portion of total market supply. Therefore, no single firm can affect price by changing its output.
The product is homogeneous, so consumers have no preference for any specific seller. If a firm tries to charge a higher price, buyers will switch to other sellers. If it charges a lower price, it will incur losses because market price is already given.
Also, there is perfect information, so buyers know the prevailing market price.
Thus, a firm under perfect competition accepts the price determined by the industry and adjusts its output accordingly.
🔹 Unit 5: Market Equilibrium
3️⃣ Difference between Perfect Competition, Monopoly and Monopolistic Competition
| Basis | Perfect Competition | Monopoly | Monopolistic Competition |
|---|---|---|---|
| Number of Firms | Many | One | Many |
| Nature of Product | Homogeneous | Unique product | Differentiated product |
| Price Control | No control | Full control | Limited control |
| Entry & Exit | Free | Restricted | Free |
| Examples | Agricultural market | Railways | FMCG brands |
In perfect competition, price is determined by market forces. In monopoly, a single seller controls price. In monopolistic competition, many firms sell slightly different products and have some control over price.
4️⃣ What is Price Ceiling and Price Floor (Minimum Support Price)?
Price Ceiling is the maximum price fixed by the government above which a good cannot be sold. It is usually imposed below equilibrium price to protect consumers. For example, rent control. It often leads to excess demand or shortage.
Price Floor is the minimum price fixed by the government below which a good cannot be sold. It is generally set above equilibrium price to protect producers. An example is Minimum Support Price (MSP) for farmers. It may lead to excess supply or surplus.
Both are government interventions to stabilize market prices.
5️⃣ Effect of Increase in Demand on Market Equilibrium (with diagram explanation)
When demand increases and supply remains constant, the demand curve shifts to the right. At the old price, quantity demanded becomes greater than quantity supplied, creating excess demand.
Due to excess demand, buyers compete with each other, and price starts rising. As price rises, quantity demanded decreases and quantity supplied increases. This continues until a new equilibrium is established at a higher price and higher quantity.
Thus, increase in demand leads to:
-
Rise in equilibrium price
-
Increase in equilibrium quantity
Diagram Explanation (in words):
Original equilibrium is at point E where demand curve (D) intersects supply curve (S). When demand increases, the new demand curve (D1) shifts rightward. The new equilibrium (E1) is formed at higher price and higher output level.
📗 Unit 6: National Income
1️⃣ Calculation of National Income (Income and Expenditure Method)
National Income refers to the total income earned by the factors of production within a country during a financial year. It can be calculated by different methods, including the Income Method and Expenditure Method.
Income Method:
Under this method, national income is calculated by adding all factor incomes earned by individuals in an economy. These include:
-
Compensation of employees (wages and salaries)
-
Rent
-
Interest
-
Profit
-
Mixed income of self-employed
The sum of all these incomes gives NDP at factor cost (NDPfc).
Expenditure Method:
This method measures national income by adding all final expenditures made in the economy. The formula is:
GDPmp = C + I + G + (X – M)
Where C is consumption, I is investment, G is government expenditure, X is exports, and M is imports.
Both methods should give the same result because income generated equals expenditure made.
2️⃣ Problem of Double Counting and How to Avoid It
Double counting refers to counting the value of the same good or service more than once while calculating national income. It leads to overestimation of national income.
For example, wheat is sold to a flour mill, flour is sold to a bakery, and bread is sold to consumers. If we add the value of wheat, flour, and bread separately, the value will be counted multiple times.
To avoid double counting, only the value of final goods and services should be included. Alternatively, we can use the value added method, which includes only the value added at each stage of production.
Value added is calculated as:
Value Added = Value of Output – Intermediate Consumption
By including only final goods or value added, we get accurate national income.
3️⃣ Circular Flow of Income (Two-Sector Model)
The Circular Flow of Income explains the continuous flow of income and expenditure between households and firms in an economy. In a two-sector model, there are only households and firms.
Households provide factors of production such as land, labor, capital, and entrepreneurship to firms. In return, firms pay wages, rent, interest, and profit to households. This is called factor payment.
Households use this income to purchase goods and services from firms. This is consumption expenditure.
Thus, there are two flows:
-
Real flow (goods and services)
-
Money flow (income and expenditure)
Both flows move in opposite directions but are equal in value. This model assumes no government and no foreign sector. It shows interdependence between households and firms.
4️⃣ Difference between GDP and GNP
GDP (Gross Domestic Product) is the total value of final goods and services produced within the domestic territory of a country during a year. It includes income earned by both residents and foreigners within the country.
GNP (Gross National Product) is the total value of final goods and services produced by the residents of a country, whether within the country or abroad.
The difference between GDP and GNP is Net Factor Income from Abroad (NFIA).
Formula:
GNP = GDP + NFIA
If NFIA is positive, GNP is greater than GDP. If NFIA is negative, GDP is greater than GNP.
GDP focuses on location, while GNP focuses on nationality.
🔹 Important Formulas (Explanation)
1. GVAmp
GVAmp = Value of Output – Intermediate Consumption
It measures value added at market price.
2. GDPmp
GDPmp = C + I + G + (X – M)
This shows total expenditure on final goods and services.
3. NDPfc
NDPfc = Compensation of Employees + Operating Surplus + Mixed Income
It shows national income at factor cost.
🔹 Unit 7: Money & Banking
🔹 1️⃣ Difficulties of Barter System
The barter system is a system of exchange in which goods and services are exchanged directly for other goods and services without using money. Although it was the earliest form of trade, it had many difficulties.
The first major problem was the lack of double coincidence of wants. For exchange to occur, both parties must want each other’s goods at the same time. This made trade very difficult.
Second, there was no common measure of value. It was hard to determine how much of one good should be exchanged for another.
Third, barter lacked a standard of deferred payment, making future payments and credit transactions difficult.
Fourth, there was difficulty in storing wealth. Some goods were perishable and could not be stored for a long time.
Fifth, it was difficult to transfer goods from one place to another.
Due to these problems, money was introduced as a medium of exchange, making trade easier and more efficient.
🔹 2️⃣ Process of Credit Creation by Commercial Banks (with example)
Commercial banks create credit by accepting deposits and giving loans. The process is based on the principle that banks keep only a fraction of deposits as reserves and lend the remaining amount.
Suppose a person deposits ₹10,000 in a bank and the reserve ratio is 10%. The bank keeps ₹1,000 as reserve and lends ₹9,000 to another person. The borrower spends this money, and it gets deposited in another bank.
The second bank keeps 10% (₹900) and lends ₹8,100. This process continues multiple times.
Thus, the initial deposit of ₹10,000 leads to multiple expansions of credit in the banking system.
The total credit created depends on the credit multiplier, which is:
Credit Multiplier = 1 / Reserve Ratio
This process increases money supply in the economy.
🔹 3️⃣ Components of Money Supply (M1, M2, M3, M4)
Money supply refers to the total amount of money available in an economy at a given time. In India, money supply is measured in four forms:
M1 (Narrow Money):
-
Currency with the public
-
Demand deposits with banks
-
Other deposits with RBI
M1 is the most liquid form of money.
M2:
M1 + Savings deposits with post office savings banks.
M3 (Broad Money):
M1 + Time deposits with banks.
M3 is widely used as the main measure of money supply.
M4:
M3 + Total deposits with post office savings banks.
As we move from M1 to M4, liquidity decreases.
🔹 4️⃣ Repo Rate and Reverse Repo Rate
Repo Rate is the rate at which the central bank lends money to commercial banks against government securities. When the central bank increases the repo rate, borrowing becomes costly, reducing money supply. When it decreases the repo rate, banks borrow more, increasing money supply.
Reverse Repo Rate is the rate at which the central bank borrows money from commercial banks. When reverse repo rate increases, banks deposit more money with the central bank, reducing liquidity in the economy.
Both repo and reverse repo rates are important tools of monetary policy used to control inflation and stabilize the economy.
🔹 Unit 8: Income & Employment
🔹 1️⃣ Components of Aggregate Demand (AD) and Aggregate Supply (AS)
Aggregate Demand (AD) refers to the total demand for final goods and services in an economy at a given level of income during a period of time. It consists of four main components:
-
Consumption (C): Expenditure by households on goods and services.
-
Investment (I): Expenditure by firms on capital goods like machinery and equipment.
-
Government Expenditure (G): Spending by government on public goods and services.
-
Net Exports (X – M): Difference between exports and imports.
Thus, AD = C + I + G + (X – M).
Aggregate Supply (AS) refers to the total output produced in an economy during a given period. In the short run, AS is equal to national income (Y). It represents the total supply of goods and services available in the economy.
Equilibrium level of income is determined when AD = AS.
🔹 2️⃣ Mechanism of Investment Multiplier
The investment multiplier shows how a change in investment leads to a larger change in national income. It works on the principle that one person’s expenditure becomes another person’s income.
Suppose investment increases by ₹100 crore. This increases income of workers and producers by ₹100 crore. They spend a part of this income according to their Marginal Propensity to Consume (MPC).
If MPC is 0.8, they will spend ₹80 crore and save ₹20 crore. The ₹80 crore becomes income for others, who again spend 80% of it. This process continues in multiple rounds.
Thus, total increase in income is more than initial increase in investment.
The multiplier depends on MPC. Higher MPC leads to larger multiplier effect.
🔹 3️⃣ Deficient Demand and its Impact
Deficient demand occurs when aggregate demand is less than aggregate supply at the full employment level. It creates a deflationary gap in the economy.
When demand is low, producers reduce production because goods remain unsold. This leads to unemployment and fall in income. Lower income further reduces demand, creating a downward spiral.
Deficient demand leads to:
-
Unemployment
-
Fall in price level
-
Decrease in output
-
Economic recession
To correct deficient demand, government may increase public expenditure, reduce taxes, or adopt expansionary monetary policy.
🔹 4️⃣ Paradox of Thrift
The Paradox of Thrift states that while saving is good for an individual, excessive saving by all individuals may harm the economy.
When people try to save more, they reduce consumption. Reduced consumption decreases aggregate demand. Lower demand leads to fall in production, income, and employment.
As income falls, total savings in the economy may remain the same or even decrease.
Thus, what is beneficial for an individual may not be beneficial for the economy as a whole. This situation is called the paradox of thrift.
🔹 5️⃣ Relationship between MPC and MPS
Marginal Propensity to Consume (MPC) is the proportion of additional income spent on consumption.
Marginal Propensity to Save (MPS) is the proportion of additional income saved.
Since income is either consumed or saved:
MPC + MPS = 1
If MPC is high, MPS is low. If MPC is low, MPS is high.
For example, if MPC = 0.8, then MPS = 0.2.
🔹 6️⃣ Elasticity of Demand Formula
Price Elasticity of Demand measures responsiveness of quantity demanded to change in price.
Formula:
Elasticity (Ed) = % Change in Quantity Demanded / % Change in Price
In simple form:
Ed = (Change in Q / Q) ÷ (Change in P / P)
If Ed > 1 → Elastic demand
If Ed < 1 → Inelastic demand
If Ed = 1 → Unit elastic demand
🔹 7️⃣ Multiplier Formula
The multiplier (K) shows how much national income increases due to change in investment.
K = 1 / (1 – MPC)
Since MPS = 1 – MPC,
K = 1 / MPS
Also,
K = ΔY / ΔI
Where ΔY = Change in income
ΔI = Change in investment
If MPC is 0.8, then
K = 1 / (1 – 0.8) = 1 / 0.2 = 5
This means income increases five times the initial increase in investment.
Unit 9: Government Budget
1️⃣ Difference between Direct Tax and Indirect Tax
Direct tax is a tax directly imposed on the income or wealth of individuals and firms. The burden of direct tax cannot be shifted to another person. Examples include income tax and corporate tax. It is progressive in nature, meaning higher income groups pay more tax.
Indirect tax is a tax imposed on goods and services. The burden of indirect tax can be shifted from producer to consumer. Examples include GST and excise duty. It is generally regressive in nature because all consumers pay the same rate regardless of income.
Thus, direct tax is paid directly to the government by the taxpayer, while indirect tax is collected by producers from consumers and then paid to the government.
2️⃣ Difference between Developmental and Non-Developmental Expenditure
Developmental expenditure refers to government spending that promotes economic growth and development. It includes expenditure on education, health, infrastructure, agriculture, and industry. Such expenditure increases productive capacity and improves living standards.
Non-developmental expenditure refers to spending that does not directly contribute to economic growth. It includes expenditure on defense, interest payments on loans, pensions, and administrative services.
While developmental expenditure creates assets and enhances productivity, non-developmental expenditure is necessary for maintaining law, order, and administration but does not directly increase production.
3️⃣ Objectives of Government Budget (Reallocation and Stability)
The government budget is an annual statement of estimated revenue and expenditure. It has several objectives.
Reallocation of Resources: The government aims to reduce income inequality by taxing rich people more and providing subsidies and welfare schemes to the poor. This ensures fair distribution of income and wealth.
Economic Stability: The government uses fiscal policy to control inflation and deflation. During inflation, it may reduce expenditure or increase taxes. During recession, it increases expenditure or reduces taxes to boost demand.
Thus, the budget plays an important role in promoting economic growth and maintaining stability.
4️⃣ What is Deficit Budget? Types of Deficit
A deficit budget occurs when government expenditure exceeds its revenue during a financial year. It indicates that the government needs to borrow money to meet its expenses.
There are three main types of deficit:
-
Revenue Deficit: When revenue expenditure exceeds revenue receipts.
-
Fiscal Deficit: When total expenditure exceeds total receipts excluding borrowings.
-
Primary Deficit: Fiscal deficit minus interest payments.
A high fiscal deficit may lead to inflation and increased public debt.
Unit 10: Open Economy
1️⃣ Difference between Balance of Payments (BOP) and Balance of Trade (BOT)
Balance of Trade refers to the difference between exports and imports of goods only. If exports exceed imports, it is a trade surplus. If imports exceed exports, it is a trade deficit.
Balance of Payments is a broader concept. It records all economic transactions between residents of a country and the rest of the world. It includes trade in goods, services, income, and capital transfers.
Thus, BOT is a part of BOP.
2️⃣ Items of Current Account and Capital Account of BOP
The Current Account includes transactions related to:
-
Export and import of goods
-
Export and import of services
-
Income receipts and payments
-
Unilateral transfers (remittances, gifts)
The Capital Account includes transactions related to:
-
Foreign investment
-
Loans and borrowings
-
Banking capital
-
Change in foreign exchange reserves
The current account shows trade performance, while the capital account shows financial transactions.
3️⃣ Determination of Foreign Exchange Rate (Demand & Supply)
Foreign exchange rate is determined by the forces of demand and supply of foreign currency in a free market.
Demand for foreign exchange arises due to imports, foreign travel, investment abroad, and repayment of loans.
Supply of foreign exchange arises from exports, foreign investment in the country, and remittances.
When demand for foreign currency increases, its price rises (depreciation of domestic currency). When supply increases, its price falls (appreciation of domestic currency).
Equilibrium exchange rate is determined where demand and supply curves intersect.
4️⃣ Difference between Devaluation and Depreciation
Devaluation is a deliberate reduction in the value of domestic currency by the government under a fixed exchange rate system. It is done to promote exports and reduce imports.
Depreciation is a fall in the value of domestic currency due to market forces under a flexible exchange rate system. It occurs automatically when demand for foreign currency increases.
Thus, devaluation is government-controlled, while depreciation is market-determined.