Reasons for Measuring National Income and How They Shape Planning
There are eight main reasons for measuring national income, and each one helps governments judge how an economy is performing and what to do next. Countries measure national income to track growth, compare performance and plan policy.
1. To Measure Economic Growth
National income is measured to determine whether an economy is growing, remaining stagnant, or declining. By comparing the national income of a country over different years, economists can determine changes in the level of economic activity.
For example, if a country's real national income increases consistently over several years, it may indicate that the country is producing more goods and services. This information helps the government assess the overall performance of the economy and determine whether existing economic policies are achieving their objectives.
2. To Compare Economic Performance Over Time
National income statistics make it possible to compare the economic performance of a country from one period to another.
For example, the government can compare the country's national income in 2024 with that of 2025 to determine whether economic conditions have improved or worsened. Such comparisons can reveal changes in production, income, and expenditure over time.
However, when making meaningful comparisons, changes in prices and population should be taken into consideration.
3. To Compare the Economic Performance of Different Countries
One of the key reasons for measuring national income is that it allows countries to be compared. For example, the national income and per capita income of Nigeria can be compared with those of Ghana, Kenya, or South Africa.
Such comparisons help to show differences in the size and performance of economies. International organisations also use national income statistics when analysing and comparing countries.
How Reasons for Measuring National Income Guide Government Planning
4. To Assist Government in Economic Planning
The government needs accurate information about the economy when preparing development plans. National income statistics provide information about the level of production, income, consumption, investment, and the contribution of different sectors to the economy.
This information can help the government decide where resources should be directed. For example, if statistics show that agriculture contributes significantly to national income but faces low productivity, the government may give greater attention to agricultural development.
Also Read: The Main Economic Effects of Taxation on the Economy
5. To Formulate Economic Policies
National income statistics provide information that helps the government formulate appropriate economic policies. For example, information about changes in production, consumption, investment, and income can assist the government when making decisions about taxation, government expenditure, employment, and investment.
If economic activity is falling, the government may introduce measures to encourage production and investment. Therefore, national income statistics provide an important basis for economic decision-making.
Per Capita Income and Living Standards
6. To Determine Per Capita Income
National income is measured so that per capita income can be calculated. Per capita income is obtained by dividing national income by the population of the country.
Per Capita Income = National Income ÷ Population
For example, if a country's national income is ₦10 trillion and its population is 100 million:
Per Capita Income = ₦10,000,000,000,000 ÷ 100,000,000 = ₦100,000
Per capita income gives an estimate of the average income per person and is useful when comparing countries or examining changes in average income over time.
7. To Assess Changes in Standard of Living
National income statistics can provide information about changes in the material standard of living of a population. When real per capita income increases, people may have greater purchasing power and may be able to consume more goods and services.
However, national income alone cannot provide a complete measure of standard of living because factors such as income distribution, environmental quality, health, security, and access to social services also matter. Therefore, national income is only one of several indicators used to assess people's material wellbeing.
Sector Contributions to the Economy
8. To Determine the Contribution of Different Sectors to the Economy
National income accounting helps to determine the contribution of different sectors of an economy to total national output. These sectors may include agriculture, manufacturing, mining, construction, transportation, banking, education and other services.
By examining the contribution of each sector, the government can identify sectors that are growing, declining or contributing significantly to economic activity. This information can help in deciding which sectors require greater investment, support, or policy attention.
Summary of the Reasons for Measuring National Income
To measure economic growth.
To compare economic performance over time.
To compare different countries.
To assist government planning.
To formulate economic policies.
To calculate per capita income.
To assess changes in material living standards.
To determine the contribution of different sectors to the economy.
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