Also, communism was so inefficient that it basically took the countries under it from international competition - they couldn't develop anything advanced that would match products created under capitalism, and so were essentially forced to sell resources (eg. minerals, food) or low-processed industrial products (eg. steel) in exchange for more advanced stuff such as medicine or electronics, for which they paid through the nose. Basically, the process was not dissimilar to colonialism that preceeded it, and created massive growth for capitalist countries - so much so that in the US people doing unskilled work could afford a good life for their family on a single salary. Now that communism is dead, those unskilled people in the West are unfortunately in for some rude awakening (already in progress).