The problem with trying to draw real world comparisons is that I do not think any of the basic appraoches (capitalism, market planning, socialism, communism) even exist in their pure form. Most, if not all countries, practice some hybrid.

I'd just hand in the following quote and call it a day:

Capitalism is where man takes advantage of his fellow man. Communism is the other way around.

Can't remember the source.

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Don of Borg - Cool, Calm, Collective.

"Within the next generation I believe that the world's leaders will discover that infant conditioning and narco-hypnosis are more efficient, as instruments of government, than clubs and prisons, and that the lust for power can be just as completely satisfied by suggesting people into loving their servitude as by flogging them and kicking them into obedience." -- Aldous Huxley