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Résumé
In macroeconomics, an industry is a branch of an economy that produces a closely related set of raw materials, goods, or services. For example, one might refer to the wood industry or to the insurance industry.
When evaluating a single group or company, its dominant source of revenue is typically used by industry classifications to classify it within a specific industry. For example the International Standard Industrial Classification (ISIC) – used directly or through derived classifications for the official statistics of most countries worldwide – classifies "statistical units" by the "economic activity in which they mainly engage". Industry is then defined as "set of statistical units that are classified into the same ISIC category". However, a single business need not belong just to one industry, such as when a large business (often referred to as a conglomerate) diversifies across separate industries.
Other industry classification systems include the North American Industry Classification System (NAICS), which was developed through partnerships with North American countries such as the United States, Canada, and Mexico, in order to standardize the comparison of business activities in North America. There is also the Global Industry Classification Standard (GICS), which is used to assign companies to specific economic sectors and industry groups.
There are many industry classifications in the modern economy, which can be grouped into larger categories called economic sectors. Sectors are broader than industry classifications. For example, the retail trade sector contains industries such as clothing stores, shoe stores, and health and personal care stores. Companies are not limited to one sector or industry. They can reside in multiple sectors and industries.
Industries, though associated with specific products, processes, and consumer markets, can evolve over time. One distinct industry (for example, barrelmaking) may become limited to a tiny niche market and get mostly re-classified into another industry using new techniques.
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