What are the basic assumptions of a democratic society?

One of the basic or central aspects of a democratic society is the assumption that citizens, by and large, are the better judges of their own interests whenever they have free access to information that concerns themselves. This takes into consideration of using common sense with personal decisions and the common sense of not injuring others. With this access, information and common sense, citizens elect reasonable people to public office and hold them accountable for their actions while in public office.