Revision: National Income >> National Income and Circular Flow of Income Economics ISC (Commerce) Class 12 CISCE

• "The labour and capital of a country acting on its natural resources produce annually a certain net aggregate of commodities, material and immaterial, including services of all kinds. This is the true net annual income or revenue of the country or national dividend." - Marshall
• "National income is that part of the objective income of the community, including of course income derived from abroad, which can be measured in money." - Pigou
• "The national dividend or income consists solely of services as received by ultimate consumers, whether from their material or from their human environments. Thus, a piano or an overcoat made for me this year is not a part of this year's income, but an addition to capital. Only the services rendered to me during this year by these things are income." - Fisher

• "National income estimate measures the value of commodities and services turned out during a given period, counted without duplication." - N.I.C. of India
• "National income is the sum of wages, rent, interest and profit or the sum of all goods and services produced by the economy during one income period." - Shapiro 

1. The circular flow of income is a model of an economy showing connections between different sectors of an economy.
2. It shows flows of income, goods and services, and factors of production between economic agents such as firms, households, government, and nations.
3. The circular flow analysis is the basis of national accounts and macroeconomics.

• Income earned within a country by residents and non-residents.
• It is a geographical concept.

Relation:

• Domestic Income = National Income − Net Factor Income from Abroad

• Measures standard of living and economic welfare
• Shows inflationary & deflationary trends
• Explains economic structure (sector-wise contribution)
• Basis for economic planning and policy
• Helps in budget, taxation & borrowing policies
• Guides consumption–investment decisions
• Shows income distribution
• Helps in centre–state grants allocation
• Useful in international comparisons & quotas
• Important for analysing problems of underdeveloped countries

• It shows the continuous flow of income, output and expenditure in an economy
• Production → Income → Expenditure → Production (repeats continuously)
• Households supply factor services and receive wages, rent, interest, profit
• Firms produce goods/services and receive expenditure from households
• Involves two flows: Real flow (goods & factor services) and Money flow (payments)
• Buyer’s expenditure = seller’s income

• Equality: Value of production = income earned = expenditure made in an economy.
• Reason: Firms produce goods → pay income to households → households spend this income.
• Leakages: Withdrawals from the flow – savings, taxes, imports.
• Injections: Additions to the flow – investment, government spending, exports.
• Condition: Circular flow continues smoothly when leakages = injections.

• Household Sector: Owns factors (land, labour, capital), earns income, spends on goods/services, saves and pays taxes.
• Business/Firm Sector: Hires factors, produces goods/services, sells to households, government, and abroad.
• Government Sector: Collects taxes, buys goods and factor services, provides public services (education, health, defence).
• Foreign Sector (Rest of the World): Involves exports, imports, and cross-border factor services.

• Economy has only households and firms; no government, no foreign trade.
• Households supply factors (land, labour, capital) to firms and get income (wages, rent, interest, profit).
• Firms produce goods/services and sell them to households; households spend all income on consumption.
• Circular flow is constant:
  Production = Income = Expenditure
  Firms’ income = Households’ expenditure
  Households’ income = Firms’ factor payments

• Economy has households and firms, plus capital (financial) market.
• Households save part of income → saving (S) = leakage from circular flow.
• Firms invest in capital goods → investment (I) = injection into circular flow.
• Savings flow from households to firms through financial institutions.

Equilibrium condition:

• S = I → circular flow remains stable.

Disequilibrium:

• S > I → income falls.
• I > S → income rises.

• Shows interdependence of households, firms, government and foreign sector.
• Helps in measuring national income through income, output and expenditure flows.
• Explains macroeconomic equilibrium (e.g. S = I, leakages = injections).
• Identifies leakages (saving, taxes, imports) and injections (investment, govt. spending, exports).
• Helps study disequilibrium and ways to restore balance.
• Useful for monetary policy and fiscal policy analysis.
• Highlights importance of macro variables like income, consumption, saving and investment.