The only reason that socialism appears to work for any length of time is because it's riding on the back of capitalism. The only reason that socialism works is because it has capitalism to support it. And once that socialism verges into full blown communism, totalitarianism, it quickly becomes apparent that it doesn't.

There are no communist countries that have become more prosperous because of communism. Communism has not made one single country more prosperous. It's never happened.

Capitalism has made the entire world more prosperous. Capitalism has allowed for some countries to operate under some guise of socialism for at least a little while. But communism always ends in death. It always ends in destruction.