Core–periphery structure: Difference between revisions

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'''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}}

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

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==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 of center and periphery was first introduced by [[Raúl Prebisch]] in the 1950s. However, the qualitative notion that [[social networks]] can have a core–periphery structure has a long history in disciplines such as [[sociology]], [[international relations]] (Nemeth & Smith, 1985), and [[economics]] (Snyder & Kick, 1979). 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==