The document discusses several theories and models of development:
1) Rostow's classical model of development proposes that countries progress through 5 stages from traditional to modern societies as a result of investment and economic diversification.
2) Dependency theory argues that development results from international trade relationships, with powerful dominant states developing at the expense of dependent states.
3) World-system theory also sees unequal trade as the cause of underdevelopment, with a hierarchy of core, semi-peripheral, and peripheral states in the global capitalist system.
4) The neoliberal model suggests underdevelopment stems from restrictive policies and that free markets and structural adjustment programs can help countries develop through market reforms and deregulation.