The economy is divided into four sectors of economic activity: the primary sector (extracting natural resources), the secondary sector (manufacturing and construction), the tertiary sector (services), and the quaternary sector (knowledge and information). Together they cover every way people produce goods and services. As of 2023, services generate roughly 65% of world GDP, industry about 27%, and agriculture around 4% (World Bank).
What are the sectors of the economy?
Economic activities are the production processes that use the economic agents and factors of production to create goods and services that meet people’s needs. Economists classify every activity into four sectors — primary, secondary, tertiary and quaternary — based on how far it sits from the raw natural resource. Extraction is the primary sector; each later sector adds more transformation, service or knowledge.
The four sectors of the economy at a glance
| Sector | What it does | Example activities | Approx. share of world GDP (2023) |
|---|---|---|---|
| Primary | Extracts natural resources | Agriculture, fishing, forestry, mining, oil & gas | ~4% (agriculture) |
| Secondary | Transforms raw materials into goods | Manufacturing, construction, energy & utilities | ~27% (industry) |
| Tertiary | Provides services | Retail, health, education, finance, transport, tourism | ~65% (services) |
| Quaternary | Knowledge & information | R&D, IT, data, consulting | Counted within services |
Source: World Bank value-added shares of GDP (approximate, latest available). The quaternary sector is a knowledge-based subset usually reported inside services.
Primary sector: extracting natural resources
The primary sector gathers raw materials directly from nature: agriculture, livestock breeding, forestry, fishing, hunting, mining, and oil and gas extraction. In lower-income economies it employs the largest share of workers, while in advanced economies it is a small share of GDP but still strategically vital.
Read the full guide to the primary economic sector →
Secondary sector: manufacturing and construction
The secondary sector transforms raw materials into finished goods. It covers manufacturing, construction, and the generation and distribution of water, electricity and gas. Industrialisation is driven by the growth of this sector.
Read the full guide to the secondary sector →
Tertiary sector: services
The tertiary sector provides services rather than physical goods: retail and wholesale trade, real estate, government and judicial activities, insurance and finance, health, media, transport and storage, education, hotels and restaurants, and telecommunications. It is the largest sector in most modern economies.
Read the full guide to the tertiary sector →
Quaternary sector: knowledge and information
The quaternary sector is the knowledge-based part of the economy: research and development, information technology, data processing, scientific research, consulting, and higher education. It is often separated from the tertiary sector to highlight the value of intellectual work in advanced economies.
Read the full guide to the quaternary sector →
What decides which activities an economy produces?
Because resources are finite, every society must choose what to produce, how to produce it, and for whom. That choice depends on the economic system. In a command economy the State sets production levels, prices and distribution; in a market economy private households and companies decide based on prices, costs and incentives. Most countries run a mixed economy that blends both.
How economic activity is measured: GDP
The total market value of all goods and services an economy produces within its borders over a period is its Gross Domestic Product (GDP). Economic activity is tracked mainly through nominal GDP and real GDP, which adjusts for inflation. The balance between the four sectors is a key signal of how developed an economy is.
Economic activities by country
Every country combines the four sectors differently. Explore country breakdowns of the primary, secondary, tertiary and quaternary sectors, for example:
- Economic activities in Mexico
- Economic activities in South Africa
- Economic activities in Vietnam
- Economic activities in Venezuela
Non-economic activities
Non-economic activities lack an economic counterpart, or the price paid does not reflect the real cost of the service. Examples include charitable and volunteer work carried out for social benefit, and unpaid household chores such as cleaning, childcare or home repairs.
Last updated: July 4, 2026
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