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|Primary sector: raw materials
Secondary sector: manufacturing
Tertiary sector: services
|Colin Clark · Jean Fourastié|
|Quaternary sector · Quinary sector|
|Sectors by ownership|
|Business sector · Private sector · Public sector · Voluntary sector|
The three-sector hypothesis is an economic hypothesis which divides economies into three sectors of activity: extraction of raw materials (primary), manufacturing (secondary), and services (tertiary). It was developed by Colin Clark and Jean Fourastié.
According to the hypothesis, the main focus of an economy's activity shifts from the primary, through the secondary and finally to the tertiary sector. Fourastié saw the process as essentially positive, and in The Great Hope of the Twentieth Century he writes of the increase in quality of life, social security, blossoming of education and culture, higher level of qualifications, humanisation of work, and avoidance of unemployment.
Countries with a low per capita income are in an early state of development; the main part of their national income is achieved through production in the primary sector. Countries in a more advanced state of development, with a medium national income, generate their income mostly in the secondary sector. In highly developed countries with a high income, the tertiary sector dominates the total output of the economy, according to the hypothesis.
Structural transformation according to Fourastié 
The distribution of the workforce among the three sectors progresses through different stages as follows, according to Fourastié:
First phase: Traditional civilizations 
- Primary sector: 70%
- Secondary sector: 20%
- Tertiary sector: 10%
This phase represents a society which is scientifically not yet very developed, with a negligible use of machinery. The state of development corresponds to that of European countries in the early Middle Ages, or that of a modern-day developing country.
Second phase: Transitional period 
- Primary sector: 20%
- Secondary sector: 50%
- Tertiary sector: 30%
More machinery is deployed in the primary sector, which reduces the number of workers needed. As a result, the demand for machinery production in the secondary sector increases. The transitional phase begins with an event which can be identified with industrialisation: far-reaching mechanisation (and therefore automation) of manufacture, such as the use of conveyor belts.
The tertiary sector begins to develop, as do the financial sector and the power of the state.
Third phase: Tertiary civilization 
- Primary sector: 10%
- Secondary sector: 20%
- Tertiary sector: 70%
The primary and secondary sectors are increasingly dominated by automation, and the demand for workforce numbers falls in these sectors. It is replaced by the growing demands of the tertiary sector. The situation now corresponds to modern-day industrial societies and the society of the future, the service or post-industrial society. Today the tertiary sector has grown to such an enormous size that it is sometimes further divided into an information-based quaternary sector, and even a quinary sector based on non-profit services.
See also 
- Jean Fourastié
- Primary sector of the economy
- Secondary sector of the economy
- Tertiary sector of the economy
- Quaternary sector of the economy
- Quinary sector of the economy
- Information Revolution
- De-industrialization crisis
- Private sector
||This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (August 2008)|
- This article incorporates information from
Further reading 
- Bernhard Schäfers: Sozialstruktur und sozialer Wandel in Deutschland. ("Social Structure and Social Change in Germany") Lucius und Lucius, Stuttgart 7th edition 2002
- Rainer Geißler: Entwicklung zur Dienstleistungsgesellschaft. In: Informationen zur politischen Bildung. Nr. 269: Sozialer Wandel in Deutschland, 2000, p. 19f.
- Jean Fourastié: Die große Hoffnung des 20. Jahrhunderts. ("The Great Hope of the 20th Century") Köln-Deutz 1954
- Hans Joachim Pohl: Kritik der Drei-Sektoren-Theorie. ("Criticism of the Three Sector Theory") In: Mitteilungen aus der Arbeitsmarkt- und Berufsforschung. Issue 4/Year 03/1970, p. 313-325
- Stefan Nährlich: Dritter Sektor: "Organisationen zwischen Markt und Staat." ("Third Sector: Organizations Between Market and State"). From "Theorie der Bürgergesellschaft" des Rundbriefes Aktive Bürgerschaft ("Theory of the Civil Society" of the newsletter "Active Civil Society") 4/2003
- Uwe Staroske: Die Drei-Sektoren-Hypothese: Darstellung und kritische Würdigung aus heutiger Sicht ("The Three-Sector-Hypothesis: Presentation and Critical Appraisal from a Contemporary View"). Roderer Verlag, Regensburg 1995