First of all...I am not sure if Benedict really said this or not. But I have read that benedict is an authoritarian liberal which is a tendency towards communism.
Second, if Benedict said this, I would like to know if this has become Catholic Doctrine. Until I know for a fact that it has become Catholic Doctrine, I will disagree with this idea.
Third, I think communism is a sin, and without Capitalism....other places in the world would starve to death because there would be no wealthy people to donate to them. In a communist system, mankind (as a whole) will never reach its maximum potential. Why? because you are not allowed to be better at something than someone else. Plus there is no incentive to succeed in life when you know you will get the same as everyone else no matter what. Communism is terrible. Free-Market capitalism is the only way to go.