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primary proto- second secondary deutero-third tertiary trito-fourth quaternary, quartary: tetarto- fifth quinary (pempto-) sixth senary (ecto-, hecto-) seventh
In the 20th century, economists began to suggest that traditional tertiary services could be further distinguished from "quaternary" and quinary service sectors. Economic activity in the hypothetical quaternary sector comprises information- and knowledge-based services, while quinary services include industries related to human services and ...
This sector evolves in well-developed countries where the primary and secondary sectors are a minority of the economy, and requires a highly educated workforce. [4] For example, the tertiary and quaternary sectors form the largest part of the UK economy, employing 76% of the workforce.
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.
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.
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)
Early attempts at using in-cell NMR to study protein quinary structure were hindered by a limitation caused by the very phenomenon they were trying to understand. Many probe proteins tested in these experiments turned out to produce broad signals, near the detection limit of the method, when measured inside cells of Escherichia coli .
Allan George Barnard Fisher (26 October 1895 – 8 January 1976) was a New Zealand-born economist.. Perhaps his most notable contribution was to investigate economic development in terms of the sequential dominance of different sectors of the economy: the primary, secondary and tertiary sectors (three-sector theory).