Communist planning has a single planning unit for the whole country, while corporations, even very large ones, are still much smaller. Communism cannot effectiv

Communist planning has a single planning unit for the whole country, while corporations, even very large ones, are still much smaller. Communism cannot effectively decentralize management because it has a single indivisible source of power at the very top. (As a result the central government has to manage everything; e.g. in USSR the baking recipes for a Lithuanian bakery had to be approved in the central ministry in Moscow.) Under capitalism the power (economic power) belongs to the owner of capital and thus it can easily have lots of independently managed units. In addition under capitalism there's a feedback cycle that tends to strip you of that power (the capital) if your enterprise is not efficient, so the system is also much more dynamic than that of communism. All the rest is just the natural result of cybernetic laws, such as the law of requisite variety: the controlling element has to be as complex as the system it controls. Under capitalism there's no limit to the complexity of the management system, because it's decentralized and dynamic; every grocery store has a full-fledged human brain working solely for the benefit of the store. Under communism the complexity of the central planning unit simply cannot match the complexity of the capitalist management system. There's an interesting quirk though: the governing system cannot be overthrown, so instead of the growing economy replacing the inefficient controller, the inefficient controller simplifies the economy. The defining characteristic of all communists societies is that their economy and technology are very primitive (aside from few selected branches). They kind of flew to the space, but you cannot buy decent underpants :)