{{For|the language theory|Center versus periphery}}
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{{citation style|date=March 2018}}
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[[File:Core-Periphery Network.png|thumb|A Network with an idealized core–periphery structure]]
'''Core peripheryCore–periphery structure''' is a [[network theory]] model.
==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==
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==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.
