However, despite the Saemaul Movement's great success in reducing poverty and improving living conditions in rural areas during its first phase, income levels in urban areas were still higher than income levels in rural areas after the rapid industrialization of South Korea. The government-led movement with its highly centralized organization proved to be efficient in the 1970s and early 1980s, but it became less effective after South Korea entered into a more developed and industrialized stage, which diminished the momentum of the movement. The relatively low income levels in rural areas compared to urban areas became a major political issue in the late 1980s – one that no government intervention was able to fully solve during the first phase – and the movement proved ultimately inadequate in addressing the larger problem of migration from the villages to the cities by the country's younger demographic. Moreover, the government-led centralized system caused corruption, such as misuse of funding, and changed South Korea's environment.