The answer to our wealth disparity is to put power in the hands of the average person.

Average voter: "Ugh, all the power and responsibility is too much work. Can't we just elect someone that takes care of all of this for us?" Congress/parliaments are born. "Ugh, keeping track of all these politicians and their policies and waiting for them to enact laws is too slow and tedious. Can't we just elect some sort of super politician that promises to take care of all our problems quickly?"