Trade and economy
Are driven by desire or want, if those things we want and desire today become freely available whenever we want them, then we will evolve to want something else that is not freely available.
Not everything is about what can be manufactured; the art and antiques trades are proof of that, trade and thus economy will always exist, even if what an individual wants or desires is an experience or an emotion, simply restricting one's view to consumerist production which is what a Command Economy would do would still miss much of what people would be willing to pay for in one way or another. There are reams of Sci-fi stories covering such things, particularly from the 50s and 60s.
Biting the hand that feeds IT
