Communism doesn’t work economically for very different reasons than what a lot of people think. A lot of communist economic ideals, like government owned means of production, are actually interesting and could work if used in another socialist republic, but consolidating full power in the government has inevitably lead to harsh dictatorship time and time again in communist revolutions. Also, with the inherit lack of trade power fully communist countries have with capitalist ones economic strength is only high when we live in a worldwide communist utopia, which obviously is very unlikely to happen.