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. 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.
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. At the same time, entirely new industries may branch off from older ones once a significant market becomes apparent (as the semiconductor industry became distinguished from the wider electronics industry).
Industry classification is valuable for economic analysis because it leads to largely distinct categories with simple relationships. However, more complex cases, such as otherwise different processes yielding similar products, require an element of standardization and prevent any one schema from fitting all possible uses.
Economic theories group industries further into larger categories dubbed economic sectors.
Norton, Norton (2015) . "General Motors: Lost Dominance". In Tremblay, Victor J.; Tremblay, Carol Horton (eds.). Industry and Firm Studies (4 ed.). London: Routledge. p. 271. ISBN 9781317468028. Retrieved 10 October 2021.
It was noteworthy that GM's dominance was in an extremely important industry. In simplest economic terms, it is a foundational industry. [...] The motor vehicle industry is a bellwether industry—its success has long been a signal of the state of the American economy.
- Compare: "Industry". Merriam-Webster.com Dictionary. Merriam-Webster. 4 August 2020. Retrieved 11 August 2020.
1 b: a distinct group of productive or profit-making enterprises [...]
c: a department or branch of a craft, art, business, or manufacture
- "'Definition of Industry' Investopedia". 2003-11-20. Archived from the original on 2017-07-22. Retrieved 2015-05-22.
Individual companies are generally classified into an industry based on their largest sources of revenue. For example, while an automobile manufacturer might have a financing division that contributes 10% to the firm's overall revenues, the company would be classified in the automaker industry by most classification systems.
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