Sectors of the economy: primary, secondary and…

Core facts

Primary (agriculture and allied): uses natural resources directly: farming, dairy, fishing, forestry, mining.
Secondary (industry): turns raw materials into other goods: manufacturing, construction, electricity, gas and water supply.
Tertiary (services): activities that support production and provide services: trade, hotels, transport, communication, banking, insurance, real estate, public administration, education, health, IT.
The three-sector classification is credited to Colin Clark and A.G.B. Fisher.
Organised sector: registered with the government, follows rules (such as the Factories Act), has regular hours, job security and social security.
Unorganised sector: small, scattered units, often outside government control; low and irregular pay, little security.
About nine in ten Indian workers are in the unorganised sector (NCEUS, 2007: about 92 per cent).
In India, the tertiary sector is the largest sector of GDP; the primary sector still employs the largest share of workers, though its share of GDP is much smaller.

Explained

The three sectors

Dairy counts as primary because it depends on natural, biological processes. Cotton is primary; cloth is secondary. Selling the cloth is tertiary.
The secondary sector is called industrial in common usage. In national accounts the industry group includes mining, manufacturing, electricity-gas-water and construction. NCERT treats mining as primary; some national account tables place mining in industry. Read the question's source.
Quaternary and quinary are extensions: knowledge work (research, IT) and top decision-making.
Tertiary activities are not "producing goods" but help the other sectors. Transport and storage carry goods; banks provide credit.

Structural change in India

Over time, the share of agriculture in GDP falls, industry rises and then flattens, and services rise. India skipped a long, large industrial phase: services overtook both.
NCERT's comparison of 1977-78 and 2017-18 shows the tertiary sector had replaced the primary sector as the largest producer.
Employment lags output: the primary sector still employs a far larger share of workers than its share of GDP. This is the problem of disguised unemployment in agriculture.

Organised and unorganised

Feature	Organised	Unorganised
Registration	Registered	Mostly unregistered
Pay and hours	Regular, fixed	Irregular, long hours
Benefits	Pension, PF, leave	Few or none
Examples	Government, large firms	Street vendors, farm labour, small shops

Under the Factories Act, 1948, a factory is a unit with 10 or more workers with power (or 20 or more without power). The Act is now subsumed in the Occupational Safety, Health and Working Conditions Code, 2020 (in force from 21 November 2025), which raises these thresholds to 20 with power and 40 without power.
Public sector and private sector are classified by ownership. Organised and unorganised are classified by regulation. They are not the same thing.

Deeper

NCEUS definition (2007). The unorganised sector is unincorporated private enterprises owned by individuals or households, engaged in sale or production of goods and services, with fewer than 10 workers. Unorganised workers are those without employment or social security benefits from employers. Informal employment can exist inside the formal sector (contract workers).
NCEUS was headed by Arjun Sengupta.
Why services lead. India's growth was led by IT and business services, telecommunications and finance after 1991, driven by skills, English and exports of services. Critics say this has created jobless growth, because services are skill-heavy.
The 'missing middle'. Manufacturing in India has stayed near the mid-teens as share of GDP for decades, unlike East Asia where it reached 25–30 per cent. The National Manufacturing Policy (2011) targeted raising the share to 25 per cent.
Measurement. Since the 2015 series, CSO/NSO measures the informal sector through surveys (NSS Enterprise surveys, now the ASUSE) as well as Annual Survey of Industries data for the formal sector.
Employment measure. The Periodic Labour Force Survey (PLFS) is the main source of data on formal and informal jobs.

Common traps

✗ "Mining is a secondary activity." ✓ Under the usual textbook classification mining is primary (extracting natural resources). National accounts may group it under industry.
✗ "Organised sector means the public sector." ✓ It is about registration and regulation. A government job is organised, but so is a large private firm.
✗ "Tertiary activities produce goods." ✓ They produce services, which support goods production.
✗ "Agriculture is the largest contributor to GDP today." ✓ The tertiary sector is the largest.
✗ "The Factories Act covers all units with 5 workers." ✓ It covered 10+ with power, 20+ without power; the OSH Code, 2020 that replaced it uses 20+ with power, 40+ without.

Quick revision

Primary: nature. Secondary: manufacturing. Tertiary: services.
Clark–Fisher classification.
Organised = registered and regulated; unorganised = scattered, no security.
About 92 per cent of workers are unorganised (NCEUS, 2007).
Tertiary is largest in GDP; primary is far larger in employment than in output.
Factory: 10+/20+ workers (Factories Act 1948); 20+/40+ under the OSH Code 2020.

Go deeper: Mains writing (beyond what APPSC Paper I usually asks)

Mains writing Mains writing

Frame: "India has moved from an agrarian to a service-led economy without passing through a manufacturing-led phase. The result is high growth but weak job creation."
Analysis points:
- the mismatch between GDP share and employment share in agriculture
- high informality, low productivity and weak social security
- services growth is skill-intensive; manufacturing is labour-intensive but stagnant
- informality reduces tax base and makes policy transmission weak
Way forward: labour-intensive manufacturing (PLI, textiles, electronics), skilling, formalisation through digital payments, GST and the e-Shram portal, and social security codes.
Example: gig and platform workers now sit in a grey zone between formal and informal work.

Medha AI writes its own notes and checks them against the sources listed. Medha AI is an independent preparation service. It is not affiliated with, endorsed by or connected to APPSC, TSPSC, MPSC, UPSC or any other commission or government body.

6.1.1.2 Sectors of the economy: primary, secondary and tertiary; organised and unorganised

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