describe the classification of industries
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Industries can be classified in a variety of ways. At the top level, industry is often classified according to the three-sector theory into sectors: primary (extraction and agriculture), secondary (manufacturing), and tertiary (services). ... Over time, the fraction of a society's industry within each sector changes.
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Industries can be classified in a variety of ways. At the top level, industry is often classified according to the three-sector theory into sectors: primary (extraction and agriculture), secondary (manufacturing), and tertiary (services). Over time, the fraction of a society's industry within each sector changes.
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