Core–periphery structure: Difference between revisions

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{{Short description|Network theory model}}

{{For|the language theory|Center versus periphery}}

{{Multiple issues|

{{citation style|date=March 2018}}

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{{lead rewrite|date=October 2018}}

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[[File:Core-Periphery Network.png|thumb|A Network with an idealized core–periphery structure]]

'''Core–periphery structure''' is a [[network theory]] model.

'''Core periphery structure''' is a [[network theory]] model based on [[Immanuel Wallerstein|Immanuel Wallerstein's]] [[world-systems theory]].{{citation needed|date=February 2019}} He formulated the chart in the 1980s.{{Clarify|date=August 2019}}

==Models of core–periphery structures==

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===Continuous model===

This model allows for the existence of three or more partitions of node classes. However, including more classes makes modifications to the discrete model more difficult.{{needs clarificationclarify|date=August 2019}} Borgatti & Everett (1999) suggest that, in order to overcome this problem, each node be assigned a measure of ‘coreness’ that will determine its class. Nevertheless, the threshold of what constitutes a high ‘coreness’ value must be justified theoretically.

==Discussion==

Hubs are commonly found in [[empirical networks]] and pose a problem for community detection as they usually have strong ties to many communities. Identifying core–periphery structures can help circumvent this problem by categorizing hubs as part of the network's core (Rombach et al., 2014, p. 160). Likewise, though all core nodes have high centrality measures, not all nodes with high centrality measures belong to the core. It is possible to find that a set of highly central nodes in a graph does not make an internally cohesive subgraph (Borgatti & Everett, 2000)...

==Uses in economics==

The concept ofwas centerfirst andintroduced peripheryinto waseconomics firstas introduced"centre-periphery" by [[Raúl Prebisch]] in the 1950s. However, but the qualitativeorigin notionof thatthe idea could ultimately be traced back to [[socialJohann networksHeinrich von Thünen|Thünen]]'s can''Isolated haveState'' a(1826).<ref>{{Cite core–peripheryjournal structure|last1=Rama has|first1=J. a|last2=Hall long|first2=J. history|year=2021 in|title=Raúl disciplinesPrebisch suchand asthe [[sociology]],evolving [[internationaluses relations]]of (Nemeth'centre-periphery'in &economic Smith,analysis 1985),|journal=Review andof [[economics]]Evolutionary (SnyderPolitical &Economy Kick,|volume=2 1979).|issue=2 |pages=315–332}}</ref> Observed trade flows and diplomatic ties among countries fit this structure. [[Paul Krugman]] (1991) suggests that when transportation costs are low enough manufacturers concentrate in a single region known as the core and other regions (the periphery) limit themselves to the supply of agricultural goods.

==See also==

*[[World-systems theory]]

*[[Core countries]]

*[[Semi-periphery countries]]

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==References==

{{reflist}}

* [[Stephen Borgatti|Borgatti, S. P.]], & Everett, M. G. (1999). Models of core /periphery structures. Social Networks, 21, 375–395. doi:10.1016/S0378-8733(99)00019-2

* Krugman, P.R. (1991), Increasing returns and economic geography, Journal of Political Economy 99, 483–499.

* Nemeth, R. J., & Smith, D. A. (1985). International trade and world-system structure: A multiple network analysis (No. 8).