A world-system is a socioeconomic system, under systems theory, that encompasses part or all of the globe, detailing the aggregate structural result of the sum of the interactions between polities. World-systems are usually larger than single states, but do not have to be global. The Westphalian System is the preeminent world-system operating in the contemporary world, denoting the system of sovereign states and nation-states produced by the Westphalian Treaties in 1648. Several world-systems can coexist, provided that they have little or no interaction with one another. Where such interactions becomes significant, separate world-systems merge into a new, larger world-system. Through the process of globalization, the modern world has reached the state of one dominant world-system, but in human history there have been periods where separate world-systems existed simultaneously, according to Janet Abu-Lughod. The most well-known version of the world-system approach has been developed by Immanuel Wallerstein. A world-system is a crucial element of the world-system theory, a multidisciplinary, macro-scale approach to world history and social change.
World-systems are defined by the existence of a division of labor. The modern world-system has a multi-state political structure (the interstate system) and therefore its division of labor is international division of labor. In the modern world-system, the division of labor consists of three zones according to the prevalence of profitable industries or activities: core, semiperiphery, and periphery. Countries tend to fall into one or another of these interdependent zones core countries, semi-periphery countries and the periphery countries. Resources are redistributed from the underdeveloped, typically raw materials-exporting, poor part of the world (the periphery) to developed, industrialized core.
World-systems, past world-systems and the modern world-system, have temporal features. Cyclical rhythms represent the short-term fluctuation of economy, while secular trends mean deeper long run tendencies, such as general economic growth or decline. The term contradiction means a general controversy in the system, usually concerning some short term vs. long term trade-offs. For example, the problem of underconsumption, wherein the drive-down of wages increases the profit for the capitalists on the short-run, but considering the long run, the decreasing of wages may have a crucially harmful effect by reducing the demand for the product. The last temporal feature is the crisis: a crisis occurs, if a constellation of circumstances brings about the end of the system.
The world-systems theory stresses that world-systems (and not nation states) should be the basic unit of social analysis. Thus we should focus not on individual states, but on the relations between their groupings (core, semi-periphery, and periphery).
The most well-known version of the world-system approach has been developed by Immanuel Wallerstein, who has provided several definitions of what a world-system is, twice in 1974, first
"...a system is defined as a unit with a single division of labor and multiple cultural systems."
and second as
"…a social system, one that has boundaries, structures, member groups, rules of legitimation, and coherence."
In 1987 he elaborated his definition:
"...not the system of the world, but a system that is a world and which can be, most often has been, located in an area less than the entire globe. World-systems analysis argues that the units of social reality within which we operate, whose rules constrain us, are for the most part such world-systems [...]. ...there have been thus far only two varieties of world-systems: world-economies and world empires. A world-empire (examples, the Roman Empire, Han China) are large bureaucratic structures with a single political center and an axial division of labor, but multiple cultures. A world-economy is a large axial division of labor with multiple political centers and multiple cultures."
World System vs. world-system(s)
"... In English, the hyphen is essential to indicate these concepts. "World system" without a hyphen suggests that there has been only one world-system in the history of the world."
There is an ongoing debate among scholars whether we can talk about multiple world-systems. For those who support the multiple world-systems approach, there have been many world-systems throughout worlds history, some replacing others, as was the case when a multipolar world-system of the 13th-14th centuries was replaced by a series of consecutive Europe- and the West-centered world-systems. Others coexisted unknowingly with others, not linked to them directly or indirectly; in those cases the world-systems weren't worldwide (for example, prior to colonization of Americas, the Americas world-systems had no connection with the one encompassing Eurasia and Africa). From around 19th century onward, due to the process of globalization, many scholars agree that there has been only one world-system, that of capitalism. There are, however, dissenting voices, as some scholars do not support the contention that there is only one world-system in the modern day; Janet Abu-Lughod states that multiple world-systems did exist in past epochs.
The alternative approach insists that there was only one World System that originated in the Near East five or even ten thousand years ago, and gradually encompassed the whole world; thus, the present-day truly global World System can be regarded as its continuation.
- Carlos A. Martínez-Vela, World Systems Theory, paper prepared for the Research Seminar in Engineering Systems, November 2003
- Thomas Barfield, The dictionary of anthropology, Wiley-Blackwell, 1997, ISBN 1-57718-057-7, is" hyphen&f=false Google Print, p.498-499
- Immanuel Wallerstein, (2004), WORLD-SYSTEMS ANALYSIS, in World System History , [Ed. George Modelski, in Encyclopedia of Life Support Systems (EOLSS), Developed under the Auspices of the UNESCO, Eolss Publishers, Oxford ,UK
- Wallerstein. 1974. "The Rise and Future Demise of the World-Capitalist System: Concepts for Comparative Analysis." Comparative Studies in Society and History 16: p. 390. Cited after 
- Immanuel Wallerstein (1974) the Modern World-System, New York, Academic Press, pp. 347-57.
- E.g., Chase-Dunn Ch. K. and Hall Th. D. (1997), ‘Rise and Demise. Comparing World - Systems’ Boulder, Colorado: Westview Press.
- Abu-Lughod, Janet (1989), "Before European Hegemony: The World System AD. 1250-1350"
- André Gunder Frank, Barry K. Gills, The world system: five hundred years or five thousand?, Routledge, 1996, ISBN 0-415-15089-2, Google Print, p.3
- J. Timmons Roberts; Amy Hite (4 January 2000). From modernization to globalization: perspectives on development and social change. Wiley-Blackwell. pp. 192–. ISBN 978-0-631-21097-9. Retrieved 21 January 2011.
- Robert Asen; Daniel C. Brouwer (2001). Counterpublics and the state. SUNY Press. pp. 235–. ISBN 978-0-7914-5161-8. Retrieved 21 January 2011.
- Gerard Delanty (1999). Social theory in a changing world: conceptions of modernity. Wiley-Blackwell. pp. 70–. ISBN 978-0-7456-1918-7. Retrieved 21 January 2011.
- Janet Abu-Lughod. Discontinuities and persistence. One world system or a succession of systems?. In André Gunder Frank; Barry K. Gills (1996). The world system: five hundred years or five thousand?. Psychology Press. pp. 278–. ISBN 978-0-415-15089-7. Retrieved 21 January 2011.
- André Gunder Frank, Barry K. Gills, The world system: five hundred years or five thousand?, Routledge, 1996, ISBN 0-415-15089-2
- Korotayev A. A Compact Macromodel of World System Evolution // Journal of World-System Research 11 (2005): 79–93; Korotayev A., Malkov A., Khaltourina D. (2006). Introduction to Social Macrodynamics: Compact Macromodels of the World System Growth. Moscow: KomKniga. ISBN 5-484-00414-4; Korotayev A. The World System urbanization dynamics. History & Mathematics: Historical Dynamics and Development of Complex Societies. Edited by Peter Turchin, Leonid Grinin, Andrey Korotayev, and Victor C. de Munck. Moscow: KomKniga, 2006. ISBN 5-484-01002-0. P. 44-62