According to postdevelopment theorists, the idea of development is just a 'mental structure' (Wolfgang Sachs) which has resulted in a hierarchy of developed and underdeveloped nations, of which the underdeveloped nations desire to be like developed nations. Development thinking has been dominated by the West and is very ethnocentric, according to Sachs. The Western lifestyle may neither be a realistic nor a desirable goal for the world's population, postdevelopment theorists argue. Development is being seen as a loss of a country's own culture, people's perception of themselves and modes of life. According to Majid Rahnema, another leading postdevelopment scholar, things like notions of poverty are very culturally embedded and can differ a lot among cultures. The institutes which voice the concern over underdevelopment are very Western-oriented, and postdevelopment calls for a broader cultural involvement in development thinking.