12th Economics Comprehensive Study Guide :

Introduction to Micro and Macro Economics

• Modern economics is divided into two primary branches: Micro Economics and Macro Economics.

• Etymology:

  • Micro: Derived from the Greek word "Mikros", meaning small or a millionth part.

  • Macro: Derived from the Greek word "Makros", meaning large.

• Origin: These terms were coined in $1933$ by Norwegian economist Ragnar Frisch of Oslo University.

• Ragnar Anton Kittil Frisch ($1895–1973$):

  • A Norwegian econometrician and joint winner (with Jan Tinbergen) of the first Nobel Prize for Economics in $1969$.

  • He pioneered econometrics, which applies mathematical and statistical techniques to economic theories.

  • He is credited with being the first to refer to the study of individual firms and producers as "Microeconomics" and the study of the aggregate economy as "Macroeconomics."

Micro Economics: Meaning, Scope, and Features

• Definition of Micro Economics:

  • Maurice Dobb: "Micro economics is in fact a microscopic study of the economy."

  • Prof. A. P. Lerner: "Micro economics consists of looking at the economy through a microscope… to see how the millions of cells in the body of economy… play their part in the working of the whole economic organism."

• Historical Review:

  • This is the traditional approach, tracing back to classical economists like Adam Smith, David Ricardo, and J. S. Mill.

  • It was popularized by Neo-Classical Economist Prof. Alfred Marshall in his book Principles of Economics ($1890$).

• Scope of Micro Economics:

  • Theory of Product Pricing: Determines prices through market forces of demand (consumer behavior) and supply (producer behavior).

  • Theory of Factor Pricing: Determines rewards for factors of production: Land (Rent), Labour (Wages), Capital (Interest), and Entrepreneur (Profit).

  • Theory of Economic Welfare: Focuses on efficiency in resource allocation.

    • Efficiency in production: Maximum output from given resources.

    • Efficiency in consumption: Distribution of goods to maximize total society satisfaction.

    • Overall economic efficiency: Producing goods most desired by people.

• Features of Micro Economics:

  • Study of Individual Units: Focuses on small units like a single firm or household.

  • Price Theory: Also known as price theory because it explains price determination for goods and factors.

  • Partial Equilibrium: Analyzes the equilibrium of an individual unit in isolation.

  • Based on Assumptions: Uses the ceteris paribus (other things remaining constant) assumption, involving models like perfect competition and laissez-faire.

  • Slicing Method: Divides the economy into small units for detailed study (e.g., individual income vs. national income).

  • Marginalism Principle: Uses the "marginal" concept (change in total by an additional unit) as a key analytical tool.

  • Analysis of Market Structure: Studies structures like Monopoly, Oligopoly, and Monopolistic Competition.

  • Limited Scope: Does not address nationwide problems like inflation or unemployment.

• Importance of Micro Economics:

  • Aids in price determination and understanding free market economies.

  • Assists in model building, business decision-making, and formulating government policies (taxation, price policy).

  • Forms the basis of welfare economics.

Macro Economics: Meaning, Scope, and Features

• Definition of Macro Economics:

  • J. L. Hansen: "Macro economics is that branch of economics which considers the relationship between large aggregates such as the volume of employment, total amount of savings, investment, national income etc."

  • Prof. Carl Shapiro: "Macro economics deals with the functioning of the economy as a whole."

• Historical Review:

  • Predates Micro Economics; practiced by Mercantilists ($16^{th}$ and $17^{th}$ century) and Physiocrats ($18^{th}$ century).

  • Modern Macro Economics was developed by Lord John Maynard Keynes after the Great Depression, specifically in his book General Theory of Employment, Interest and Money ($1936$).

• Scope of Macro Economics:

  • Theory of Income and Employment: Explains determinants of national income and causes of fluctuations (business cycles).

  • Theory of General Price Level and Inflation: Analyzes the cause of inflation and deflation.

  • Theory of Economic Growth and Development: Strategies to accelerate growth and address poverty.

  • Macro Theory of Distribution: Deals with the relative shares of rent, wages, interest, and profit in total national income.

• Features of Macro Economics:

  • Study of Aggregates: Deals with the whole economy (National Income, Aggregate Demand).

  • Income Theory: Focuses on the measurement and fluctuations of national income.

  • General Equilibrium Analysis: Studies functional relationships between demand, supply, and prices for the whole economy.

  • Interdependence: Considers how variables like investment affect income and employment.

  • Lumping Method: Studies the whole "forest" rather than individual "trees" (Prof. Boulding).

  • Growth Models: Includes models like the Mahalanobis growth model focusing on heavy industries.

  • Policy-oriented: A science that suggests policies to promote growth and control inflation.

• Importance of Macro Economics:

  • Provides understanding of the functioning of complex economic systems.

  • Essential for formulating national income policies and evaluating economic performance.

  • Helps study variables like total output and general price levels.

Utility Analysis

• Concept of Utility: The capacity of a commodity to satisfy human wants (want-satisfying power).

• Features of Utility:

  • Relative concept: Changes with time and place (e.g., woollens in winter).

  • Subjective concept: Differs from person to person based on taste and habits.

  • Ethically neutral: Utility exists regardless of whether the want is good or bad (e.g., a knife for cooking or harm).

  • Differs from usefulness and pleasure: A bitter medicine has utility but is not pleasant; liquor has utility to an addict but is not useful.

  • Hypothetical measurement: Cannot be measured cardinally; only experienced (positive, zero, or negative).

  • Basis of demand: A person demands what gives them utility.

• Types of Utility:

  1. Form Utility: Change in shape/structure (e.g., wood to furniture).

  2. Place Utility: Change in location (e.g., sand at a construction site).

  3. Service Utility: Rendered by professionals (e.g., doctors, teachers).

  4. Knowledge Utility: Acquiring knowledge about a product.

  5. Possession Utility: Transfer of ownership from seller to buyer.

  6. Time Utility: Change in time of utilization (e.g., umbrellas in monsoon; blood banks).

• Concepts of Utility:

  • Total Utility ($TU$): Aggregate utility from all units consumed.

  • Marginal Utility ($MU$): Additional utility from the last unit consumed.

  • Formulae:

    • $TU = \sum MU$

    • $MU_n = TU_n - TU_{n-1}$

• Law of Diminishing Marginal Utility ($DMU$):

  • Introduced by Prof. Gossen, detailed by Alfred Marshall ($1890$).

  • Statement: "Other things remaining constant, the additional benefit which a person derives from a given increase in his stock of a thing, diminishes with every increase in the stock that he already has."

  • Assumptions: Rationality, cardinal measurement, homogeneity, continuity, reasonability, constancy, divisibility, and single want.

  • Point of Satiety: Where $TU$ is maximum and $MU = 0$. Consumption beyond this leads to "disutility" ($MU$ becomes negative).

  • Exceptions: Hobbies, misers, addictions, power, and money (though these often violate the assumptions).

  • Criticisms: Unrealistic assumptions, cardinal measurement is impossible in reality, and non-applicability to indivisible goods.

• MU and Price Relationship:

  • Equilibrium is achieved where $MU_x = P_x$ (Marginal Utility equals Price).

Demand Analysis

• Meaning of Demand: An effective desire backed by willingness and ability to pay.

  • $Demand = Desire + Willingness + Ability to pay$

• Demand Schedule: Tabular representation of the relationship between price and quantity.

  • Individual Demand: Quantity demanded by a single consumer.

  • Market Demand: Sum total of quantities demanded by all consumers ($A + B + C$).

• Reasons for Downward Sloping Demand Curve:

  1. Law of Diminishing Marginal Utility.

  2. Income Effect (real income increases as price falls).

  3. Substitution Effect.

  4. Multi-purpose uses of goods.

  5. Entry of new consumers at lower prices.

• Types of Demand:

  1. Direct Demand: Consumer goods (e.g., sugar).

  2. Indirect Demand: Factors of production (e.g., labor in a factory).

  3. Complementary/Joint Demand: Goods used together (e.g., car and fuel).

  4. Composite Demand: One good for multiple uses (e.g., electricity).

  5. Competitive Demand: Substitutes (e.g., tea and coffee).

• Determinants of Demand: Price, Income, Prices of substitutes and complements, Nature of product, Population size, Future expectations, Tastes/Preferences, and Taxation levels.

• Law of Demand:

  • Statement: "Other things being equal, higher the price… smaller is the quantity demanded; lower the price… larger is the quantity demanded."

  • Functional Relationship: $D_x = f(P_x)$

  • Exceptions: Giffen's Paradox (inferior goods), Prestige goods (Veblen effect), Speculation, Price Illusion, and Ignorance.

• Variations vs. Changes in Demand:

  • Variations (Price Change only): Expansion (downward movement on curve) and Contraction (upward movement).

  • Changes (Other factors change): Increase (rightward shift of curve) and Decrease (leftward shift).

Elasticity of Demand

• Concept: Measures the responsiveness of quantity demanded to changes in price or other factors.

• Types of Elasticity:

  1. Income Elasticity ($E_y$): Response to income changes ($Positive$ for normal goods, $Negative$ for inferior goods, $Zero$ for necessities).

  2. Cross Elasticity ($E_c$): Response to change in price of related goods ($Positive$ for substitutes, $Negative$ for complements).

  3. Price Elasticity ($E_d$): Response to change in price ($E_d = \frac{\% \Delta Q}{\% \Delta P}$).

• Types of Price Elasticity:

  1. Perfectly Elastic ($E_d = \infty$): Slight price change causes infinite demand change (Horizontal curve).

  2. Perfectly Inelastic ($E_d = 0$): Price change has no effect (Vertical curve).

  3. Unitary Elastic ($E_d = 1$): Percentage changes are equal (Rectangular hyperbola curve).

  4. Relatively Elastic ($E_d > 1$): Demand change is greater than price change (Flatter curve).

  5. Relatively Inelastic ($E_d < 1$): Demand change is less than price change (Steeper curve).

• Measurement Methods:

  1. Ratio/Percentage Method: $E_d = \frac{\Delta Q}{Q} \times \frac{P}{\Delta P}$

  2. Total Expenditure Method: Compares total outlay before and after price change.

  3. Point/Geometric Method: Used for measuring elasticity at a specific point on the curve.

     • $Point E_d = \frac{\text{Lower segment below the point}}{\text{Upper segment above the point}}$

Supply Analysis

• Basic Concepts:

  • Total Output: Total quantity produced in a given period.

  • Stock: Total quantity available for sale; the source of supply.

  • Supply: The quantity offered for sale at a given price and time; a flow concept.

• Law of Supply:

  • Introduced by Alfred Marshall ($1890$).

  • Statement: "Other things being constant, higher the price… more is the quantity supplied; lower the price… less is the quantity supplied."

  • Symbolically: $S_x = f(P_x)$

  • Exceptions: Backward bending labor supply curve (where higher wages eventually lead to less work/more leisure), agricultural goods, urgent need for cash, and rare goods.

• Cost Concepts:

  • Total Cost ($TC$): $TFC + TVC$

  • Average Cost ($AC$): $\frac{TC}{TQ}$

  • Marginal Cost ($MC$): $TC_n - TC_{n-1}$

• Revenue Concepts:

  • Total Revenue ($TR$): $Price \times Quantity$

  • Average Revenue ($AR$): $\frac{TR}{TQ}$

  • Marginal Revenue ($MR$): $TR_n - TR_{n-1}$

Forms of Market

• Definition: A network of dealings between potential buyers and sellers.

• Classification by Time:

  • Very Short Period (days): Supply is fixed.

  • Short Period (less than $1$ year): Adjustments in variables like labor.

  • Long Period (up to $5$ years): All factors and costs are variable.

  • Very Long Period (more than $5$ years): All inputs are variable.

• Perfect Competition Features: Large number of buyers/sellers, homogeneous product, free entry/exit, single uniform price, perfect market knowledge, perfect mobility of factors, absence of transport costs, and no government intervention.

• Price Determination: Occurs at the point where market demand equals market supply (Equilibrium Price).

• Monopoly Features: Single seller, no close substitutes, barriers to entry, price maker, and price discrimination.

  • Types: Private, Public (Government), Legal (Patents/Copyrights), Natural, Simple, Discriminating, and Voluntary (OPEC).

• Oligopoly Features: Few firms, interdependence, aggressive advertising, entry barriers, lack of uniformity in size, and uncertainty.

• Monopolistic Competition Features: Fairly large number of sellers/buyers, product differentiation (brands), selling costs (advertising), and free entry/exit.

Index Numbers

• Definition: A statistical tool to measure changes in an economic variable over time or location. Referred to as "barometers of economic activity."

• Terminologies: Base Year (denoted by suffix $0$, index assumed as $100$) and Current Year (denoted by suffix $1$).

• Types:

  1. Price Index: Measures price level changes.

  2. Quantity Index: Measures changes in physical volume of production.

  3. Value Index: Measures changes in $\sum (p \times q)$.

  4. Special Purpose Index: Export-Import, labor productivity, etc.

• Construction Methods:

  • Simple Index: Every commodity gets equal importance.

  • Weighted Index: Assigns weights (usually quantities).

    • Laspeyre's Index (Base year weights): $P_{01} = \frac{\sum p_1 q_0}{\sum p_0 q_0} \times 100$

    • Paasche's Index (Current year weights): $P_{01} = \frac{\sum p_1 q_1}{\sum p_0 q_1} \times 100$

National Income

• Definition (NIC $1949$): "A national estimate measures the volume of commodities and services turned out during a given period counted without duplication."

• Features: Macro-economic concept, includes only final goods/services, net aggregate value (excludes depreciation), includes net income from abroad ($X-M$), and measured for a financial year ($April 1$ to $March 31$ in India).

• Concepts:

  • $GDP = C + I + G + (X - M)$

  • $NDP = GDP - \text{Depreciation}$

  • $GNP = C + I + G + (X - M) + (R - P)$

  • $NNP = GNP - \text{Depreciation}$

• Measurement Methods:

  1. Output Method: Adds the value of final goods or "Value Added" at each stage.

  2. Income Method: Adds factor payments: $NI = Rent + Wages + Interest + Profit + Mixed Income + (X - M)$.

  3. Expenditure Method: Adds all spending: $NI = C + I + G + (X - M) + (R - P)$.

• Difficulties: Transfer payments, illegal income, unpaid services (housewives), double counting, and valuation of inventories.

Public Finance in India

• Functions of Government:

  • Obligatory: Defence, law and order.

  • Optional: Education, health, social security.

• Components of Public Finance:

  1. Public Expenditure: Classified into Revenue, Capital, Developmental, and Non-developmental.

  2. Public Revenue:

     • Tax Revenue: Direct (Income tax) and Indirect (GST).

     • Non-tax Revenue: Fees, fines, prices of public services, special assessments, grants, and borrowings.

  3. Public Debt: Internal (from citizens/banks within the country) and External (from foreign agencies/IMF/World Bank).

  4. Fiscal Policy: Management of spending, taxes, and debt.

  5. Financial Administration: Preparation and implementation of the Budget.

• Government Budget Types:

  • Balanced: $Receipts = Expenditure$

  • Surplus: $Receipts > Expenditure$ (useful during inflation).

  • Deficit: $Receipts < Expenditure$ (useful during depression).

Money and Capital Markets in India

• Money Market: Market for short-term funds (maturity $< 1$ year).

  • Organized Sector: RBI (Apex body), Commercial Banks, Co-operative Banks, DFIs, and DFHI.

  • Unorganized Sector: Indigenous bankers, money lenders, and unregulated intermediaries (Chit funds).

• Reserve Bank of India (RBI): Established $April 1, 1935$, nationalized $1949$. Duties: Currency issue, banker to government, banker's bank, custodian of foreign exchange, and controller of credit.

• Capital Market: Market for long-term funds (equity and debt).

  • Constituents: Gilt-edged (Government securities) market, Industrial securities market (Primary and Secondary/Stock exchange), and Financial Intermediaries.

  • Regulator: Securities and Exchange Board of India (SEBI).

Foreign Trade of India

• Types: Import Trade, Export Trade, and Entrepot Trade (importing to process and re-export).

• Role: Earns foreign exchange, encourages investment, promotes division of labor, and ensures stability in price levels.

• Concepts:

  • Balance of Trade ($BOT$): Difference between value of visible exports and imports.

  • Balance of Payments ($BOP$): Systematic record of all international economic transactions (includes visible and invisible items).

• Trends: Increasing volume of trade, growth in engineering goods and petroleum product exports, and significant import of petroleum and gold.

Questions & Discussion

• What are the main branches of modern economics and who coined the terms? (Micro and Macro, Ragnar Frisch).

• Define National Income according to the NIC ($1949$).

• Explain the Law of Diminishing Marginal Utility with its assumptions.

• Distinguish between Expansion of Demand and Increase in Demand.

• What is the difference between Internal and External debt?

• Describe the functions of the Reserve Bank of India.

• What are the methods of measuring Price Elasticity of Demand?

• Would you like the summary of the next section regarding detailed case studies or advanced economic policy applications?