Measurement of National Income Class 12 Economics Notes 2026-27

National income can be measured by studying the production, income, and expenditure generated in an economy during an accounting year. Since the same economic activity can be viewed from different sides, there are three main methods of measuring national income.

The Measurement of National Income Class 12 Economics Notes 2026-27 covers these three methods in a simple sequence. These are the Value Added Method, Income Method, and Expenditure Method. Each method focuses on a different aspect of economic activity.

The Value Added Method looks at the value created during production. The Income Method calculates the factor incomes generated from production. The Expenditure Method measures the expenditure made on final goods and services.

Understanding these methods is important because questions can ask about their definitions, components, formulas, and precautions.

Measurement of National Income Class 12 Economics Notes 2026-27 PDF Download

Students can download the handwritten notes PDF for quick revision of the methods of calculating national income. The PDF covers the Value Added Method, Income Method, and Expenditure Method along with their important components, formulas, and precautions.

The notes are useful for revising the chapter before solving questions or preparing for examinations.

Methods of Measuring National Income

There are three main methods used to calculate national income:

1. Value Added Method, also called the Product Method or Net Output Method

2. Income Method, also called the Distributed Share Method or Factor Payment Method

3. Expenditure Method, based on consumption expenditure and investment expenditure

All three methods study the same economic activity from different perspectives. The Value Added Method focuses on production, the Income Method focuses on factor income, and the Expenditure Method focuses on final expenditure.

1. Value Added Method

The Value Added Method is also known as the Product Method or Net Output Method. Under this method, national income is measured by calculating the value added by different producing units during an accounting year.

Value Added = Value of Output − Intermediate Consumption

The first step is to calculate the value of output.

If the entire output produced during the year is sold, then:

Value of Output = Sales

If some output remains unsold, the change in stock is also considered.

Value of Output = Sales + Change in Stock

The change in stock is calculated as:

Change in Stock = Closing Stock − Opening Stock

The Value Added Method also requires care to avoid double counting.

Problem of Double Counting

Double counting occurs when the value of a good or service is counted more than once while calculating national income. This can happen when the value of intermediate goods is added along with the value of final goods.

There are two ways to avoid this problem:

• Final Output Method: Only the value of final goods and services is considered.

• Value Added Method: The value added by each producing unit is added.

For example, when a farmer sells wheat to a flour mill, and the flour mill sells flour to a bakery, the value of wheat should not be counted again as part of the final output. Only the value added at each stage should be considered.

Precautions Under Value Added Method

The sale of second-hand goods is not included because these goods were produced in an earlier period. However, the commission earned by an agent for selling a second-hand good is included.

Own-account production is included when estimating value added. For example, wheat produced and consumed by a farmer for self-consumption is included.

Value added is calculated by deducting the value of intermediate goods used during production from the value of output.

Value Added = Value of Output − Value of Intermediate Goods Used in Production

2. Income Method

After measuring national income through production, it can also be measured by looking at the income generated from that production. This is done through the Income Method.

The Income Method measures the total factor incomes generated within the domestic territory of a country during an accounting year.

The major factor incomes are:

• Compensation of Employees

• Operating Surplus

• Mixed Income

Compensation of Employees

Compensation of employees includes wages, salaries, and other benefits paid to employees for their services.

It represents the income received by employees for participating in the production process.

Operating Surplus

Operating surplus includes income from property and entrepreneurship.

Income from property includes rent and interest. Income from entrepreneurship includes profit.

Operating surplus does not arise in the subsistence sector or the general government sector.

Mixed Income

Mixed income refers to the income of self-employed individuals. In the case of self-employed workers, it can be difficult to separate the income received for different factors of production. Therefore, such income is treated as mixed income.

• The relationship can be expressed as: NDPFC = Compensation of Employees + Operating Surplus + Mixed Income

• To obtain Net National Product at Factor Cost: NNPFC = NDPFC + Net Factor Income from Abroad

These formulas connect domestic factor income with national income.

Precautions Under Income Method

Certain receipts are not included while calculating national income through the Income Method.

Transfer payments such as old-age pensions, unemployment allowances, and financial assistance to disaster victims are excluded. These payments are unilateral and are not received for providing current productive services.

Gifts received from abroad are also excluded.

Leisure-time activities are not included because they are not accounted for in national income or national product. For example, growing vegetables in a kitchen garden for personal use is not included.

Services rendered by housewives are also excluded.

Interest received from a friend on a loan used for consumption purposes is not included.

Corporate profit tax is included because it forms a part of profit.

Services of law and order and defence provided by the general government are included because they form part of collective consumption.

Imputed rent on owner-occupied houses is also included in national income.

3. Expenditure Method

The third approach is the Expenditure Method. While the first method studies production and the second studies income, this method studies expenditure on final goods and services.

The Expenditure Method measures Gross Domestic Product at Market Price as the total of final consumption expenditure and investment expenditure incurred within the domestic territory during an accounting year. It is then adjusted to arrive at national income.

The main components of final expenditure are:

1. Private Final Consumption Expenditure

2. Government Final Consumption Expenditure

3. Investment Expenditure

4. Net Exports

Private Final Consumption Expenditure

Private Final Consumption Expenditure, represented by C, refers to expenditure made by households on final consumption.

It covers expenditure on final goods and services purchased for consumption.

Government Final Consumption Expenditure

Government Final Consumption Expenditure, represented by G, refers to final consumption expenditure made by the government.

Government spending on services that form part of collective consumption is considered under this component.

Investment Expenditure

Investment expenditure is represented by I. It includes fixed investment and inventory investment.

Fixed investment includes:

• Business fixed investment

• Fixed investment by households in the construction of houses

• Public fixed investment

Inventory investment refers to the change in stock during the year.

Inventory Investment = Closing Stock − Opening Stock

Net Exports

Net exports are represented by X − M.

They refer to the difference between exports and imports.

Net Exports = Exports − Imports

Exports are included because exported goods are produced domestically. Imports are excluded from domestic production because they are produced outside the domestic territory.

The formula given in the notes is:

GDPMP = Private Final Consumption Expenditure + Government Final Consumption Expenditure + Gross Domestic Fixed Capital Formation + Change in Stock + Net Exports

The Expenditure Method therefore considers expenditure made on final goods and services and avoids including intermediate expenditure.

The Measurement of National Income Class 12 Economics Notes 2026-27 brings these methods, components, formulas, and precautions together in one place. Students should focus on understanding the difference between intermediate and final goods, factor income and transfer income, and domestic production and foreign income.

For revision, the handwritten notes can be used alongside the chapter to recall the definitions, classifications, formulas, and exclusions covered under each method.

Related Resources:

• CBSE Class 12 Economics Mid Term Notes 2026-27

• CBSE Class 12 Political Science Mid Term Notes 2026-27