Singapore's tight politcal control which hinders the kind of free expression which is considered normal in advanced economies is raising questions about Singapore's future and the kind of society it sees itself as becoming. Different opinions are coming from within the ruling PAP party and from the public. Issues are immigration, property prices, growing inequality, similiar to those facing native Hong Kong people. Non residents and permanent residents made up 39% of Singapore's population of 5.5 million in 2014. A law professor at Singapore Management University reflects the trend of public opinion saying it is not a question of whether but when Singapore evolves into a two or multi-party system of government.