I think communism could work, and the reason it hasn't is that it was always put into place violently. The historical trend for any type of government put into place under violent circumstances is one that is corrupt and will hold all the wealth. Many African countries copied or modeled their constitution off of the constitution of the United States, yet they are hardly experiencing the prosperity that the USA is. There are more factors that determine whether or not an economic model will work than the type of economic model. I am not exactly an advocate of communism. While I prefer it idealistically, I don't see it as a realistic option for any nation any time soon.