That is life

Communism: Social Doctrine in which capital is abolished and replaced by the workforce that is at the service of the state.
The property is abolished and a single social class, the  proletariat is constituted. Communism on the S XIX, developed by Karl Marx and Friedrich Engels.

  Democracy: Formula of organization of society, which ultimately chosen by representatives of the people, the ways forward in the social, economic and political. 
Democracy has its origins in the S XV BC, Plato and Aristotle.

There are other systems, but all are based on more or less, in Communism and Democracy.