Rational Planning should be called Irrational Planning. This is because the planners do not have any objective feedback mechanism (like a price system).
I buy a plot of 640 acres north of Houston for 100 million dollars, and create Rogers Forest. I layout where the Shops and Houses should be, based on a set of rules of thumb on traffic and economics. I build the infistructure using a MUD. I make tons of money if I do well, and go bankrupt if I do not.
I am in charge of Portland Metro. I blow money on stuff, because the taxpayer has my back. I do not know or care about doing a good job because there is no profit motive.