One method is by the three-sector hypothesis:
 Primary sector extracts natural materials and provides raw materials for secondary industry. 
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Introduction 

 India is the fastest growing large economy in the world, with an enormous population, favourable demographics and high catch-up potential due to low initial GDP per head.
 As per the World Bank data, in 2017, India became the sixth largest economy with a GDP of USD 2.59 trillion, relegating France to the seventh position.
 India is likely to surpass the United Kingdom in the world's largest economy rankings in 2019, according to a report by global consultancy firm PwC.

 According to World Economic Outlook report of IMF, India's economy is expected to grow by 7.5 per cent in the 2019-20 fiscal year, keeping an upward trajectory as the rest of the world slumps.
 According to report "India's economy is poised to pick up in 2019, benefiting from lower oil prices and a slower pace of monetary tightening than previously expected, as inflation pressures ease," the report said.
 As per Central Statistics Office (CSO), Ministry of Statistics and Programme Implementation (MOSPI), the growth in GDP during 2018-19 is estimated at 7.2 percent as compared to the growth rate of 6.7 per cent in 2017-18.

Economic Sectors 

 Economic activities result in the production of goods and services while sectors are the group of economic activities classified on the basis of some criteria.
 The Indian economy can be classified into various sectors on the basis of ownership, working conditions and the nature of the activities.
 All economic activity was in the primary sector during early civilisation. After the surplus production of food, people’s need for other products increased which led to the development of the secondary sector.
 The growth of secondary sector spread its influence during the industrial revolution in the nineteenth century.
 A support system was needed to facilitate the industrial activity. Certain sectors like transport and finance played an important role in supporting the industrial activity.

Primary Sector 

 In Primary sector of economy, activities are undertaken by directly using natural resources. Agriculture, Mining, Fishing, Forestry, Dairy etc. are some examples of this sector.
 It is called so because it forms the base for all other products. Since most of the natural products we get are from agriculture, dairy, forestry, fishing, it is also called Agriculture and allied sector.
 People engaged in primary activities are called red-collar workers due to the outdoor nature of their work.

Secondary Sector 

 It includes the industries where finished products are made from natural materials produced in the primary sector. Industrial production, cotton fabric, sugar cane production etc. activities comes under this sector.
 Hence its the part of a country's economy that manufactures goods, rather than producing raw materials
 Since this sector is associated with different kinds of industries, it is also called industrial sector.
 People engaged in secondary activities are called blue collar workers.
 Examples of manufacturing sector:
 Small workshops producing pots, artisan production.
 Mills producing textiles,
 Factories producing steel, chemicals, plastic, car.
 Food production such as brewing plants, and food processing.
 Oil refinery.

Core Industries

Eight Core Industries are Electricity, steel, refinery products, crude oil, coal, cement, natural gas and fertilizers. The Index of Eight Core Industries is a monthly production index, which is also considered as a lead indicator of the monthly industrial performance. The Index of Eight Core Industries is compiled based on the monthly production information received from the Source Agencies.

Tertiary Sector/Service Sector 

 This sector’s activities help in the development of the primary and secondary sectors. By itself, economic activities in tertiary sector do not produce a goods but they are an aid or a support for the production.
 Goods transported by trucks or trains, banking, insurance, finance etc. come under the sector. It provides the value addition to a product same as secondary sector.
 This sector jobs are called white collar jobs.

Pink Collar Worker

 Pink-collar worker is one who is employed in a job that is traditionally considered to be women's work. The term pink-collar worker was used to distinguish female-orientated jobs from the blue-collar worker, a worker in manual labor, and the white-collar worker, a professional or educated worker in office positions.
 A pink collar worker need not require as much professional training as white-collar professions. They do not get equal pay or prestige.
 A pink collar worker is usually a woman. Men rarely work in pink collar jobs. Some examples of pink collar occupations are baby sitter, florist, day care worker, nurses etc.
 Lately, the pink collar worker is educated or trained. Pink collar workers are educated through training seminars or classes and they have to continue to strive for advancement in their careers.
 Today, women have more opportunities in traditionally male white-collar jobs and men work in traditionally female pink-collar jobs.

Sunrise Industry

 Sunrise industry is a term used for a sector that is just in its infancy but shows promise of a rapid boom.
 The industry is typically characterized by high growth rates, high degree of innovation and generally has plenty of public awareness about the sector and investors get attracted to its long-term growth prospects.
 On the other hand Sunrise industry rapid emergence may threaten a competing industry sector that is already in decline. Because of its dim long-term prospects, such an industry is referred to as a sunset industry.
 Existing Indian sectors that can be termed as Sunrise sectors and likely to hold us in good stead in the future in terms of employment generation and business growth are:
 Information Technology
 Telecom Sector
 Healthcare
 Infrastructure Sector
 Retail Sector
 Food Processing Industries
 Fisheries

Why did India shift from primary sector to services sector and not secondary sector? 

 The natural economic movement of a country goes from agrarian economy to an industrial economy to a service economy but India has leapfrogged from an agrarian economy to a service economy.
 One remarkable feature of India’s recent growth is diversification into services, with the services sector dominating GDP.
 India’s success in software and IT-enables serviced (ITeS) exports, has made it a significant services exporter with its share in world services exports rising from 0.6 per cent in 1990 to 3.3 per cent in 2013.
 Well educated and immense human resources, Fluency in English and availability of cheap labour are other reasons for rapid growth of service sector in the country. On the other hand low growth in Secondary sector can be attributed to:
 The license Raj
 Restrictions on foreign investment
 Lack of measures to promote private industry
 Power Deficit
 Stringent Labour laws
 Lack of skilled labour
 Delays in Land Acquisition and environmental clearances
 Import of cheap manufactured goods etc.
 Though India ranks low in terms of per capita income, its share of services in GDP is approaching the global average. Interestingly, however, the contribution of services to employment was significantly lower than the world average.
 The manufacturing sector tends to be labour intensive, hence renewed emphasis on the manufacturing through programmes like ‘Make in India’ will serve to correct this anomaly and raise employment in proportion with growth in GDP.

Quaternary Activities 

 These are specialized tertiary activities in the ‘Knowledge Sector’ which demands a separate classification.
 The quaternary sector is the intellectual aspect of the economy. It is the process which enables entrepreneurs to innovate and improve the quality of services offered in the economy.
 Personnel working in office buildings, elementary schools and university classrooms, hospitals and doctors’ offices, theatres, accounting and brokerage firms all belong to this category of services.
 Like other tertiary functions, quaternary activities can also be outsourced.

Quinary Activities 

 The quinary sector is the part of the economy where the top-level decisions are made. This includes the government which passes legislation. It also comprises the top decision-makers in industry, commerce and also the education sector.
 These are services that focus on the creation, re-arrangement and interpretation of new and existing ideas; data interpretation and the use and evaluation of new technologies.
 Profession under this category often referred as 'gold collar' professions, they represent another subdivision of the tertiary sector representing special and highly paid skills of senior business executives, government officials, research scientists, financial and legal consultants, etc.

Organised Sector 

 In this sector, employment terms are fixed and regular, and the employees get assured work and social security.
 It can also be defined as a sector, which is registered with the government and a number of acts apply to the enterprises. Schools and hospitals are covered under the organised sector.
 Workers in the organised sector enjoy security of employment. They are expected to work only a fixed number of hours. If they work more, they have to be paid overtime by the employer.

Unorganised Sector 

 An unorganised worker is a home-based worker or a self-employed worker or a wage worker in the unorganized sector and includes a worker in the organized sector who is not covered by any of the Acts pertaining to welfare Schemes as mentioned in Schedule-II of Unorganized Workers Social Security Act, 2008.
 In this sector wage-paid labour is largely non-unionised due to casual and seasonal nature of employment and scattered location of enterprises.
 The sector is marked by low incomes, unstable and irregular employment, and lack of protection either from legislation or trade unions.
 The unorganised sector uses mainly labour intensive and indigenous technology. The workers in unorganised sector, are so scattered that the implementation of the Legislation is very inadequate and ineffective. There are hardly any unions in this sector to act as watch-dogs.
 But the contributions made by the unorganised sector to the national income, is very substantial as compared to that of the organised sector. It adds more than 60% to the national income while the contribution of the organised sector is almost half of that depending on the industry.

The Public Sector 

 In the sector, government owns most of the assets and it is the part of the economy concerned with providing various governmental services.
 The purpose of the public sector is not just to earn profits. Governments raise money through taxes and other ways to meet expenses on the services rendered by it.

Classification of Central Public Sector Enterprises (CPSEs)

 CPSEs are classified into 3 categories- Maharatna, Navratna and Miniratna. Presently, there are 7 Maharatna, 16 Navratna and 71 Miniratna CPSEs.
 Maharatna Scheme was introduced for Central Public Sector Enterprises (CPSEs), with effect from 19th May, 2010, in order to empower mega CPSEs to expand their operations and emerge as global giants.
 Presently there are seven ‘Maharatna’ CPSEs, viz. (i) Bharat Heavy Electricals Limited, (ii) Coal India Limited, (iii) GAIL (India) Limited, (iv) Indian Oil Corporation Limited, (v) NTPC Limited, (vi) Oil & Natural Gas Corporation Limited and (vii)Steel Authority of India Limited.
 CPSEs fulfilling the following criteria are eligible to be considered for grant of Maharatna status:
 Having Navratna status.
 Listed on Indian stock exchange with minimum prescribed public shareholding under SEBI regulations.
 Average annual turnover of more than Rs. 25,000 crore, during the last 3 years.
 Average annual net worth of more than Rs. 15,000 crore, during the last 3 years.
 Average annual net profit after tax of more than Rs. 5,000 crore, during the last 3 years.
 Should have significant global presence/international operations.
 Criteria for grant of Navratna status
 The Miniratna Category – I and Schedule ‘A’ CPSEs, which have obtained ‘excellent’ or ‘very good’ rating under the Memorandum of Understanding system in three of the last five years, and have composite score of 60 or above in the six selected performance parameters, namely,
 net profit to net worth,
 manpower cost to total cost of production/services,
 profit before depreciation, interest and taxes to capital employed,
 profit before interest and taxes to turnover,
 earning per share and
 inter-sectoral performance.
 'Miniratna' Scheme: In October 1997, the Government had also decided to grant enhanced autonomy and delegation of financial powers to some other profit making companies subject to certain eligibility conditions and guidelines to make them efficient and competitive. These companies called ‘Miniratnas’, are in two Category-II. The eligibility conditions and criteria are:
 Category –I CPSEs should have made profit in the last three years continuously, the pre-tax profit should have been Rs. 30 crore or more in at least one of the three years and should have a positive net worth.
 Category-II CPSEs should have made profit for the last three years continuously and should have a positive net worth.
 These CPSEs shall be eligible for the enhanced delegated powers provided they have not defaulted in the repayment of loans/interest payment on any loans due to the Government.

The Private Sector 

 In the private sector, ownership of assets and delivery of services is in the hands of private individuals or companies.
 It is sometimes referred as the citizen sector, which is run by private individuals or groups, usually as a means of enterprise for profit, and is not controlled but regulate by the State.
 Activities in the private sector are guided by the motive to earn profits. To get such services we have to pay money to these individuals and companies.

PPP (Public Private Partnership)

 PPP is an arrangement between government and private sector for the provision of public assets and/or public services.
 In this type of partnership investments being undertaken by the private sector entity, for a specified period of time.
 As PPP involves full retention of responsibility by the government for providing the services it doesn’t amount to privatization.
 There is a well defined allocation of risk between the private sector and the public entity.
 Private entity is chosen on the basis of open competitive bidding and receives performance linked payments.
 PPP route can be alternative in developing countries where governments faced various constraints on borrowing money for important projects.
 It can also give required expertise in planning or executing large projects.

Sector-wise Contribution of GDP in India 

 Services sector is the largest sector of India. Gross Value Added (GVA) at current prices for Services sector is estimated at 92.26 lakh crore INR in 2018-19. Services sector accounts for 54.40% of total India's GVA of 169.61 lakh crore Indian rupees.
 With GVA of Rs. 50.43 lakh crore, Industry sector contributes 29.73%. While Agriculture and allied sector shares 15.87%.
 It is worth mentioning that agriculture sector has maximum share by working force at near 53% while services and secondary sectors shares are near 29% and 18% respectively.

Economics