WHO THE HELL DESIGNED THE SOVIET ECONOMY ?
As bad as it was, it was somewhat viable ... for awhile. Do you think YOU can design an economy ?
Can an economy be designed? Was capitalism designed by a grand master plan on a paper? Or do economies come about organically through real needs, wants, events etc.?
The problem with planning something as infinitely complex as an economy is that it's infinitely complex. How easy it is to lack the forethought of missing something. Trial and error might be the only thing that would work in terms of formal design, and who wants to have their economy be guinea pig and risk error, to great consequence? Maybe the economy is like a train, you can guide it a bit but its going to keep charging forward, and if you guide it too hard it will come off the tracks.