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Services, Characteristics and Definitions
In the 1930s, the three-sector hypothesis was developed and proposed in economic theory by Allan G. B. Fisher, Collin Clark, and Jean Fourastié independently of each other. It divides economies into three aggregated sectors of activity: (1) agriculture and extraction of raw materials (primary sector), (2) manufacturing (secondary sector), and (3) services (tertiary sector). Reference was made to changes in the economic structure and attention was drawn to the relationship between the stage of economic development and the importance of individual sectors. According to the three-sector hypothesis, the economy shifts from the primary through the secondary and finally to the tertiary sector. The theory of the three sectors has been repeatedly criticized, but the assumptions presented have been confirmed by statistics. The economies of ...
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