Sectors of the economy

The main sectors of the economy are:

  1. Primary sector – extraction of raw materials – mining, fishing and agriculture.
  2. Secondary / manufacturing sector – concerned with producing finished goods, e.g. Construction sector, manufacturing and utilities, e.g. electricity.
  3. Service / ‘tertiary’ sector –  concerned with offering intangible goods and services to consumers. This includes retail, tourism, banking, entertainment and  I.T. services.
  4. Quaternary sector (knowledge economy, education, research and development)


Video on different sectors of economy


Primary sector

The primary sector is sometimes known as the extraction sector – because it involves taking raw materials. These can be renewable resources, such as fish, wool and wind power. Or it can be the use of non-renewable resources, such as oil extraction, and mining for coal. Examples include:

  • Mining, farming, fishing.


In developing economies, the primary sectors tends to take a big share with many employed in agriculture and mining. In the 1920s, over one million people were employed in the UK coal industry. It was a key part of the economy. However, improved technology and the growth of other energy sources has seen a dramatic decline in this primary sector industry.

Secondary sector

The secondary sector makes and distributes finished goods.

  • Manufacturing – e.,g producing cars from aluminium.
  • Construction – building homes, factories
  • Utilities – providing goods like electricity, gas and telephones to households

The manufacturing industry takes raw materials and combines them to produce a higher value added finished product. For example, raw sheep wool can be spun to form a ball of better quality wool. This wool can then be threaded and knitted to produce a jumper that can be worn.

Saltaire factor by the River Aire. Built by Sir Titus Salt. This was a successful mill for producing ‘alpaca wool’

Initially, the manufacturing industry was based on labour-intensive ‘cottage industry’ e.g. hand spinning. However, the development of improved technology, such as spinning machines, enabled the growth of larger factories. Benefiting from economies of scale, they were able to reduce the cost of production and increase labour productivity. The higher labour productivity also enabled higher wages and more income to spend on goods and services.

More on: manufacturing sector

Service / tertiary sector

The service sector includes

  • Retail
  • Financial services – Insurance, investment
  • Leisure and hospitality
  • Communication
  • IT
  • Transportation

The service sector is concerned with the intangible aspect of offering services to consumers and business. It involves retail of manufactured goods. It also provides services, such as insurance and banking. In the twentieth century, the service sector has grown due to improved labour productivity and higher disposable income. More disposable income enables more spending on ‘luxury’ service items, such as tourism and restaurants.

More on: Reasons for the growth of the service sector

Quaternary/knowledge sector

  • Education
  • Research and development
  • Public sector bodies

The quaternary sector is said to the intellectual aspect of the economy. It includes education, training, the development of technology, and research and development. It is the process which enables entrepreneurs to innovate better manufacturing processes and improve the quality of services offered in the economy. Without this growth of technology and information, economic development would be slow or non-existent.

It is also known as the knowledge economy – this is the component of the economy based on human capital – IT, knowledge, education. It is primarily related to the service sector, but also is related to the high tech component of manufacturing.

Change in the importance of different sectors

A primitive economy will primarily be based on the primary sector – with most people employed in agriculture and the production of food.

As an economy develops, improved technology enables less labour to be needed in the primary sector and allows more workers to produce manufactured goods. Further development enables the growth of the service sector and leisure activities.

Change in UK economy

manufacturing share of gdp

Relative decline of UK manufacturing


Other sectors of the economy

Quinary sector

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.

Public vs Private sector

Another division is between the public sector – government and the private sector – free market, individuals and business.

The government is primarily concerned with services, such as health and education. However, the government could own key industries, such as coal mines were once nationalised in the UK. See: public vs private sector

Digital vs Traditional economy


Another division is between the traditional sector – bricks and mortar shops and the digital economy – online sales. In practice, there is an overlap between the sectors, e.g. Traditional shops have embraced aspects of the digital economy, such as online sales.

However, the digital part of the economy is becoming more pronounced with some businesses no longer having a physical presence on high street, but providing intangibles goods and services, such as Netflix.

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60 thoughts on “Sectors of the economy”

  1. Tejvan your post seems to be very useful. Thanks for enlightening on the various sectors of our economy. I came to know for the very first time about the quinary sector. I feel that the education sector play a key role in the development of other sectors.

  2. what would happen if the three sectors of an economy were to close due to the covid – 19 crisis ?

  3. These three sectors of the economy can’t be closed due to any cause because our whole economy depends upon its services. Government of our country can’t lead this happen as due to it’s services and production of goods our economy is earning wealth and they help in the production of our country and it’s improves our
    nationality among the whole world.

  4. Thanks for the simple categorization. I work as a civil engineer in construction sector. Since demonetization in 2016, the sector has suffered a huge loss, and things have deteriorated in the current covid crisis.
    Which sector do you think is evergreen if construction sector is down?. Thanks.

    • I think fruit is an economic good because it is grown and sold in the market by the farmers which comes under the primary sector
      But when it’s grown in an orchard and well maintained that may come under the secondary sector idk??

    • I assume that fruit can be both, depending on where it comes from. If it isn’t grown for sale it’s a free good, but when it is – it’s economic.


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