Economic sectors are large groups of the economy, grouped according to their place in the production chain, by their kind of work (product or service) or ownership.
Based on place in the production chain
Primary sector extracts natural materials and provides raw materials for secondary industry.
Secondary sector processes raw materials or semi-finished goods into more valuable products.
Tertiary sector is the provision of services.
Here you are some videos explaining the classification of economic sectors
PART 1
PART 2
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