How is it based on central planning? You think the government hands out business plans to the top corporations? More than half of government spending is on social welfare and that doesn't generate any money. The government depends on the private sector for taxes. I wouldn't even say it's a layered cake with government on top and private sector on the bottom. It' more of a marble cake all mixed together. All manner of powerful interests have their own plans and their own agendas.
How it works is through the defense department and the military industrial complex.
Take something like computers.
The government does ALL the grunt work. It does all the necessary basic research and development. Once something marketable is possible the private sector takes over.
Call it what you want, but that is not the so-called free market at work. It is government planning at work.
The government invests in some basic research and development and the private sector refines and expands it for profit. You bet. And the private sector on its own invests and researches in a technology and the government uses it for its own purposes (radio, transistor, insulin shots, smart phones). You bet. It's a good system and we all benefit. It's not central planning, though.