Especially as any "communist" countries we've seen are really oligarchies ... and they have indeed failed.
Combined with dictatorships. What is ironic is that one of the things that kept things somewhat 'afloat' in communist countries was the black market, as it fostered at least some level of bartering in exchange for certain services.
Most companies, especially the large multi-nationals, are also oligarchies.
Which is one of the things that Karl Marx mentioned. Not that I am any fan of his, it is a concern in a capitalist system in that a few corporations become so large, they actually begin to squash competition and absorb anything that might be a threat. And if either of those fail, they leverage their influence to push politicians to ratify their agenda. (Koch Brothers)
Guess that essentially demonstrates that if you are 'Too Big To Fail', it means you are TOO BIG.
Too be fair, it's not like this situation is unique to the United States. It just seem more pervasive nowadays as the lobbying engine has grown to ridiculous proportions in recent years, combined with that asinine Citizens United decision by the Supreme Court.