An industry is a specific classification of companies or organizations grouped together based on their primary business activities, products, or services. Economists and financial institutions use standard classification systems, like the Global Industry Classification Standard (GICS) or the North American Industry Classification System (NAICS), to organize the economy into distinct layers. The Five Main Industry Sectors
Economic activity progresses through five major industrial stages, often referred to as the three-sector theory and its modern expansions:
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