Interestingly, individual firms behave more as centrally-planned economies, and market activity is mostly absent inside of them. This is a long-studied curiosity: https://en.wikipedia.org/wiki/Theory_of_the_firm
The book _The People's Republic of Walmart_ by Leigh Phillips <sp?> and Michael Rozowski <sp?> makes a compelling argument why employing the same technologies companies use to manage supply chains and decision making on a state level could actually produce a working communist system.
Of course, we first would need to agree that this is desirable and that's probably the point where it breaks down.
Of course, we first would need to agree that this is desirable and that's probably the point where it breaks down.