Sun Yat-sen's Three Principles of the People are Nationalism, Democracy, and Livelihood. The Principle of Livelihood focused on the people's welfare and material needs. Sun Yat-sen himself elaborated on this principle, discussing basic necessities. The common articulation of the "four great needs" derived from this principle includes the fundamental material requirements for living: Yi (衣 - Clothing), Shi (食 - Food), Zhu (住 - Housing), and Xing (行 - Transportation).