In addition to its structuralist roots, dependency theory has much overlap with Neo-Marxism and World Systems Theory, which is also reflected in the work of Immanuel Wallerstein, a famous dependency theorist. Wallerstein rejects the notion of a Third World, claiming that there is only one world which is connected by economic relations (World Systems Theory). He argues that this system inherently leads to a division of the world in core, semi-periphery and periphery. One of the results of expansion of the world-system is the commodification of things, like natural resources, labor and human relationships.