An industry is a specific group of businesses or manufacturers that produce a closely related set of raw materials, goods, or services. Derived from the Latin word for diligence, modern economics uses standard industry classification systems like ISIC to organize companies based on their primary revenue sources. The Four Sectors of Industry
Global economic activities are broadly divided into four chronological layers, as outlined by Investopedia: Industry | Definition, Sectors, & Facts | Britannica Money
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