Sectors of the economy

The three 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. factories making toys, cars, food, and clothes.
  3. Service / ‘tertiary’ sector –  concerned with offering intangible goods and services to consumers. This includes retail, tourism, banking, entertainment and  I.T. services.


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.

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, mining for coal.

The raw material – wool from sheep. Primary sector

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.

More detail on primary sector

Secondary or manufacturing industry

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 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 is concerned with the intangible aspect of offering services to consumers and business. It involves retail of the 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.

The final link in the process – the sale of manufactured clothes.

More on: Reasons for the growth of the service sector

UK size of different sectors

manufacturing share of gdp

Relative decline of UK manufacturing

Other minor sectors of the economy

Quaternary/knowledge sector

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.

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

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36 thoughts on “Sectors of the economy”

  1. I would like to use your text as part of school essay my daughter is writing. She is a high school student and her paper is on economy sector. Please let me know if you authorize using part of your text as reference. Thanks!


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