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Currently, an estimated 20% of the labor force in the United States is involved in the secondary industry. [2] The secondary sector depends on the primary sector for the raw materials necessary for production.
Percentages of a country's economy made up by different sectors. Countries with higher levels of socio-economic development tend to have proportionally less of their economies operating in the primary and secondary sectors and more emphasis on the tertiary sector. The less developed countries exhibit the inverse pattern.
Secondary sector of the economy is included in the JEL classification codes as JEL: L6 ... Industry by sector and country (4 C) * Industry-related lists (4 C, 17 P) A.
At the top level, they are often classified according to the three-sector theory into sectors: primary (extraction and agriculture), secondary (manufacturing), and tertiary (services). Some authors add quaternary (knowledge) or even quinary (culture and research) sectors. Over time, the fraction of a society's activities within each sector changes.
Three sectors according to Fourastié Clark's sector model This figure illustrates the percentages of a country's economy made up by different sector. The figure illustrates that countries with higher levels of socio-economic development tend to have less of their economy made up of primary and secondary sectors and more emphasis in tertiary sectors.
The Census Bureau releases sector-by-sector statistics on the number of establishments, total business activity, annual payroll, and number of paid employees. A standardized classification of the economy into sectors makes it possible to compare census results over time.
Primary sector of the economy (the raw materials industry) Secondary sector of the economy (manufacturing and construction) Tertiary sector of the economy (the "service industry") Quaternary sector of the economy (information services) Quinary sector of the economy (humanitarian services)
Nominal GDP sector composition, 2015 (in millions of 2005 USD): [5] [6] 2005 prices are used similarly to 2010 constant prices in which they provide economic statistics where inflation is accounted for.