it's a strong possibility that, had the USSR been left in peace, it would have achieved an even greater prosperity by now Late stage communist countries couldn

it's a strong possibility that, had the USSR been left in peace, it would have achieved an even greater prosperity by now Late stage communist countries couldn't manage the manufacturing of toilet paper, there were shortages of everything. There is absolutely no reason to believe they could have achieved any prosperity, much less comparable or greater. USSR didn't fall apart because of external aggression. It was completely inefficient due to its economic system.