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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 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]
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).
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]
This theory postulates a third category of countries, the semi-periphery, intermediate between the core and periphery. Wallerstein believed in a tri-modal rather than a bi-modal system because he viewed the world-systems as more complicated than a simplistic classification as either core or periphery nations.
The first consists of a cohesive core sub-graph in which the nodes are highly interconnected, and the second is made up of a peripheral set of nodes that is loosely connected to the core. In an ideal core–periphery matrix, core nodes are adjacent to other core nodes and to some peripheral nodes while peripheral nodes are not connected with ...
Accumulation in the periphery, on the other hand, is "extraverted," meaning that it is conducted in a manner beneficial to core countries, dictated by their need for goods and raw materials. This extraverted accumulation results in export specialization, with a large proportion of developing economies devoted to producing goods to suit foreign ...