三个世界
In the field of international relations, the Three Worlds Theory () by Mao Zedong proposed to the visiting Algerian President Houari Boumédiène in February 1974 that the international system operated as three contradictory politico-economic worlds. On April 10th 1974, at the 6th Special Session United Nations General Assembly, Vice-Premier Deng Xiaoping applied the Three Worlds Theory during the New International Economic Order presentations about the problems of raw materials and development, to explain the PRC's economic co-operation with non-communist countries.