Along with the different categories, case studies have also been given and a few factors governing their pace of development have been discussed.
The Core.
In his book, Wallerstein points out that Europe moved towards the establishment of world economy based on capitalism to ensure continual economic growth. This was beneficiary for the core countries and, as it turns out, only for them. The core countries dominate and exploit the peripheral countries for labor and raw materials. Also the core countries reap most of the benefits and the peripheral countries are left with a minor portion of the profits so much so that they might be left in the dust. The core countries, to some extent, completely milk out the sources of the periphery countries. The fact that the periphery countries are desperate for profit, even if it is just a minor part, and are in no position to be making demands also helps in the core countries taking advantage of them. Even political agendas are specifically designed that things remain as they are so that only a select few are benefited. These dominant capitalist countries have a well-developed tertiary and quaternary industry with a high end production and advances in infrastructure. They have technology that surpasses the rest of the countries and actually have the capital to invest in technological research. .
For example, England was able to follow a path of development because of the emergence of overseas colonies which it recklessly exploited and reserved a major portion of their economic surplus. Also, they invested in the education of their country which led to scientific discoveries and resulted in the industrial revolution as they used their natural resources (e.g. coal reserves). Another factor was that they took cheap goods from the colonies they ruled and sold it for a high price, thus again keeping the profits for themselves. In the long run, their capital reserves increased from these accumulations which helped England become the developed country it is today.