The Constitution says that the government serves the people, the representatives speak for the people, the Constitution says that it is the people who are the sovragne not the Government. We don't need Socialism to give the people power, Capitalism and popular sovereignty are not mutually exclusive. Indeed we can enjoy the economic freedom of Capitalism without needing to fear corruption all it requires is vigilance.
Capitalism is about trading and spending money, right? Plus it uses up resources very quickly. Eventually it will collaspe in on itself, and the economy will be in shambles. Just look at most of the world today!