True communism is a paradise, where everyone works to their full potential and shares all the fruits of their labor. Some people are better than others, but it averages out for the betterment of a society as a whole.
Real communism is where people don't perform to their fullest, because they know it won't matter in the long run, and a few corrupt individuals take advantage of the system and receive more than their fair share.
True capitalism rewards people for their relative accomplishments. Those who work and perform higher than others are rewarded accordingly.
Real capitalism rewards the people who can take other people's hard work, market it, sell it, and then pocket 90% of the proceedings, all because they merely facilitated someone else's hard work.