In 1982 at the end of the Soviet Union, the average wealth per capita as around 5,800 hundred dollars. In contrast, the US's was around 13,000 dollars per capita. This is a huge difference with the U.S having twice the per capita gdp. Also communist countries only did trade with other communist countries and being that communist countries don't make the much technologically. Also, this means that the US not only traded more which is necessary for economic growth, but it also became more technologically advanced than its counterpart.