Success of the iPhone?
May I take this opportunity to indicate that any rational planner would have not been aware / capable of coming up with new gizmos? His/her area of expertise is optimising that what the economy is taught to deliver, not adding to the uncounted factors that alter the outcome of the predictions!
Effectively planned / command economy means and is largely equivalent to stagnism: if it takes us a hundred years to built a computer capable of calculating and commanding today's economy, then we must not alter *anything* to said economy lest we need longer to build a computer that can model our changes. Also, once that computer is there, it is geared to one task: raise the efficiency of the economy that existed 100 years ago...