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In economics, an industry is a classification grouping companies or organizations that share the same primary, revenue-generating business activities. Derived from the Latin word industria—meaning diligence or hard work—the term broadly defines the collective market forces that extract resources, manufacture physical goods, or provide specialized services across a modern global economy. The Four Main Economic Sectors

Economists classify all industries into four progressive tiers based on their role in the production and distribution chain: Industry | Definition, Sectors, & Facts | Britannica Money