In macroeconomics, the secondary sector of the economy is an economic sector in the three-sector theory that describes the role of manufacturing. It encompasses industries that produce a finished, usable product or are involved in construction.
https://en.wikipedia.org/wiki/Secondary_sector_of_the_economy
https://en.wikipedia.org/wiki/Three-sector_model
https://en.wikipedia.org/wiki/Triad
https://en.wikipedia.org/wiki/Trichotomy_(philosophy)
https://en.wikipedia.org/wiki/Triad_(sociology)
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