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The theory of the interstate system holds that all states are defined through their relationship to other states or through participation in the world economy, and that divisions between states help to divide the world into a core, periphery and semi-periphery. [1] [2]
In his terminology, the core is the developed, industrialized part of the world, and the periphery is the "underdeveloped", typically raw materials-exporting, poor part of the world; the market being the means by which the core exploits the periphery. Apart from them, Wallerstein defines four temporal features of the world system.
The Product Space is a network representation of the relatedness or proximity between products traded in the global market. The network exhibits heterogeneity and a core-periphery structure: the core of the network consists of metal products, machinery, and chemicals, whereas the periphery is formed by fishing, tropical, and cereal agriculture.
A world map of countries by trading status in late 20th century using the world system differentiation into core countries (blue), semi-periphery countries (yellow) and periphery countries (red), based on the list in Dunn, Kawano, Brewer (2000) Developed countries are shown in blue (according to the International Monetary Fund, as of 2008).
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 .
The semi-periphery exists because it needs to divide the economic power between the core and the periphery. Semi-periphery, referred to as the middle class by Wallerstein, is what makes the capitalist world function because it is much like the sociological structural functionalism theory, where norms, customs, traditions, and institutions act ...
Dendrimers can also be used as a solubilizing agent. Since their introduction in the mid-1980s, this novel class of dendrimer architecture has been a prime candidate for host–guest chemistry. [34] Dendrimers with hydrophobic core and hydrophilic periphery have shown to exhibit micelle-like behavior and have container properties in solution. [35]
English: Core, periphery, and semiperiphery (1975 - 2002) based on GNP per capita. Countries that consistently fell into a particular class over the 28-year period of analysis. Taken from Salvatore J. Babones' essay, "The country-level income structure of the world-economy," Journal of World-Systems Research 11, no. 1 (2005): 29-55 [1] .