National Income is the total money value of all final goods and services produced within a country during a specific period, usually one year. It also represents the sum of all incomes earned by residents from factor services (land, labor, capital, and entrepreneurship) rendered both inside and outside geographic boundaries.
In formal economic terms, National Income is equal to the Net National Product (NNP) at Factor Cost.
Core Measures of National Output
The following concepts are used to track a country’s economic performance from different perspectives:
- Gross Domestic Product (GDP): The total market value of all final goods and services produced within the geographic boundaries of a country, regardless of the nationality of the producer.
- Net Domestic Product (NDP): Calculated as $GDP - \text{Depreciation}$. It accounts for the “wear and tear” of capital assets (machinery, buildings) used during production.
- Gross National Product (GNP): The total value produced by the citizens of a country, irrespective of their physical location. It is calculated as $GDP + \text{Net Factor Income from Abroad (NFIA)}$
- Net National Product (NNP): The net value of output produced by nationals after deducting depreciation from the GNP
- ($GNP - \text{Depreciation}$)
Income-Based Measures
These measures look at how much money actually reaches individuals and households:
- Personal Income (PI): The total income individuals receive from all sources, including transfer payments (like pensions or scholarships), before paying direct taxes.
- Disposable Income: The actual amount available to households for consumption and saving after the payment of income tax
- ($Personal Income - \text{Direct Tax}$)
- Per Capita Income: The average income per person in a country, found by dividing the National Income by the total population .
Adjusting for Price Changes
Because prices fluctuate over time, economists use specific tools to determine “real” growth:
- Nominal vs. Real GDP: Nominal GDP is calculated using current market prices and does not account for inflation. Real GDP is calculated using prices from a Base Year (currently 2011-2012 in India) to show actual changes in production volume.
- GDP Deflator: A comprehensive inflation measure that tracks price changes across all domestically produced goods and services. It is calculated as $(\text{Nominal GDP} / \text{Real GDP}) \times 100$
Gross Value Added (GVA)
While GDP measures the economy from the consumer’s (demand) side, GVA measures it from the producer’s (supply) side. It is defined as the value of output minus the value of intermediate consumption.
- GDP vs. GVA: GDP includes product taxes and excludes product subsidies, whereas GVA at basic prices includes production taxes but excludes production subsidies.
Alternative Growth Indicators
Standard measures like GDP may not perfectly reflect societal well-being. Alternative measures include:
- Green GDP: An environmentally adjusted measure that accounts for the depletion of natural resources and environmental degradation.
- Gross National Happiness (GNH): A holistic approach including nine domains such as psychological well-being, health, education, and good governance.
- Human Development Index (HDI): A composite index ranking countries based on three dimensions: health (life expectancy), knowledge (schooling), and standard of living (GNI per capita).