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The three-sector model in economics divides economies into three sectors of activity: extraction of raw materials (primary), manufacturing (secondary), and service industries which exist to facilitate the transport, distribution and sale of goods produced in the secondary sector (tertiary). The model was developed by Allan Fisher, Colin Clark, and Jean…
Products, Structural transformation according to Fourastié & Overview
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sector tertiary secondary primary fourastié economy quaternary development model quinary service countries sectors national information state income value three-sector developed
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