National income is one of the most important concepts in economics. It refers broadly to the total income earned by the people or residents of a country from economic activities during a given period, generally one year. Different economists have defined national income from different perspectives, such as production, income, and consumption.
1. Alfred Marshall’s Definition
According to Alfred Marshall, national income is the labour and capital of a country acting on its natural resources to produce a net aggregate of commodities and services during a year.
In simple words, Marshall considered national income as the total net output of goods and services produced by the labour and capital of a country during one year. He also recognised the importance of natural resources in the production process.
2. A.C. Pigou’s Definition
A.C. Pigou defined national income as the part of the objective income of the community, including income from abroad, which can be measured in money.
Pigou emphasised that national income should be expressed in monetary terms so that different goods and services can be added together. His definition also included income received from abroad.
3. Irving Fisher’s Definition
Irving Fisher gave a different approach to national income. According to Fisher, national income consists of the services provided by final goods and services to consumers during a particular period.
Thus, Fisher focused more on consumption and the services obtained from goods, rather than merely measuring the value of goods produced.
4. Simon Kuznets’ Definition
Simon Kuznets, an important economist in the field of national income accounting, defined national income as the net output of commodities and services flowing during the year from the country’s productive system to final consumers.
His approach focuses on the value of final goods and services and avoids counting intermediate goods repeatedly.
5. Modern Definition
In modern economics, national income is generally understood as the total factor income earned by the normal residents of a country during an accounting year. It includes income such as:
- Wages and salaries
- Rent
- Interest
- Profits
- Mixed income of self-employed persons
Modern national income accounting also distinguishes between concepts such as GDP, GNP, NNP, and National Income.
Conclusion
The definitions given by different economists differ mainly in their emphasis. Marshall focused on production, Pigou emphasised measurable monetary income, Fisher focused on the services obtained from final goods, and Kuznets concentrated on net output and final goods and services. In general, national income represents the economic income generated by a country’s residents during a specified period, usually one year. It is an important indicator for measuring economic performance, comparing standards of living, and formulating economic policies.
