(shared) Why Communism and Capitalism Do Not Work

I remember a teacher saying that communism was a good idea, it just does not work. The obvious reason for this would be that man is not good enough for it to work. How can that be true, me and my wife living together for over 50 years, and practicing communism shows me that me and her are good enough to be communists. We have shared equally for all of these years without being equal in our abilities. She is smarter than me and works harder yet she is willing to share equally. Our marriage problems have never been from equality. When you expand this communistic living to children and pets it continues to work rather well. You might need to put pressure on a lazy child or husband to do their share. That would lead me to believe that the reason communism does not work on a larger scale is that not every one is good enough for it to work. The ones not good enough corrupt the system. This same thing seems to be true with capitalism. Corruption seems to be on the verge of destroying it. Not unlike communism, capitalism (according to father of capitalism,Adam Smith) is a way of keeping people relatively equal through competition and regulations. Why is it not working, corruption? Socialism also has its problem with corruption although it does allow the poor to benefit from this corruption. That might be the reason capitalists and socialists fight each other, not room for corruption from both the rich and poor.