Similarly, capitalism is great in theory but does not work in practice, because people are both greedy and unequal.This may be a good time to remind everyone that communism (collectivism) may sound like a great theory but does not work in practice. The reason communism does not work is because people are both lazy and greedy.
Fortunately, we have and have nearly always had a mixed economy, which combines elements of both systems, perhaps the best of both.