Classification of different industries (Cambridge International IGCSE Geography)
Specification link
This page covers section 9.1.1 of the CIE IGCSE specification .
- 9.1.1- Classification of different industries: primary, secondary, tertiary and quaternary.
Introduction: Employment sectors
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A country's economy is the **system **by which resources, goods, land and labour are arranged
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All countries face constant challenges to the development, growth and stability of their economies
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A country's political system and** type of economy** will affect the path that a country follows to grow its industries and labour markets
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The country's economy directly affects life within that country by:
- Influencing what jobs people can have
- The food people can afford to buy
- The homes people can live in
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The way a country's workforce is divided up between the sectors is called a country's employment structure
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Employment is divided into 4 sectors, with each representing different types of industries

The four sectors of industry
Primary industry
Spec point — Classification of different industries: primary, secondary, tertiary, and quaternary
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The primary sector is concerned with the extraction of raw materials from land, sea or air
- Examples include farming, mining, forestry and fishing
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Low income countries (LICs) are primarily focused on the primary sector, with most people employed in agriculture and the production of food
- Over the past 20 years, employment in primary sector industries has been declining globally
- It is in the least developed nations where the majority of the workforce is employed in the primary sector
- This is partly due to fewer students attending school and a lack of infrastructure to support manufacturing or service provision
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There are still important primary sectors in some high-income countries, like Norway (oil and forestry) and Australia (wine production).
Secondary industry
Spec point — Classification of different industries: primary, secondary, tertiary, and quaternary
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The secondary sector is concerned with the processing of raw materials and components
- Examples include oil refinement and the manufacture of goods such as vehicles
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In middle-income countries (MICs), better technology means fewer workers are needed in farming, and more people can work in factories
- Over the last few decades the number of workers employed in manufacturing has risen
- Many high-income country (HIC) businesses have relocated their production facilities to take advantage of the lower average wage rates in these economies
Tertiary industry
Spec point — Classification of different industries: primary, secondary, tertiary, and quaternary
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The tertiary sector is concerned with the provision of a wide range services for consumers and other businesses, such as leisure, banking or hospitality
- It includes a sub-sector called the quaternary sector, which is concerned with the provision of knowledge-focused services related to IT technology, consultancy or research
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In the past few years,the tertiary and quaternary sectors have grown in medium income countries
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Many businesses are now focusing on providing consumer services
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In high income countries, the proportion of the workforce employed in the service sector is high and this is increasing the focus on the quaternary sector
- High-income countries support the expansion of these sectors by using their wealth to finance higher-level training and education
Quaternary industry
Spec point — Classification of different industries: primary, secondary, tertiary, and quaternary
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The quaternary sector, or knowledge economy, builds on the tertiary sector (service sector)
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It provides specialised services focused on information- and knowledge-based industries
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This sector includes IT, research, consulting, and other intellectual activities
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It supports and develops service industries, especially digital and tech services
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The quaternary sector relies on specialised knowledge and skills, not physical inputs
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Examples include
- Computing
- Research and development (R&D)
- Education
- Project management, etc.
Exam Hint Remember that the tertiary and quaternary sectors are both service industries.
However, the quaternary sector needs a higher level of education than the tertiary sector.
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