So uber would 'buy' from some central org? Why not just cut out the middle man then and deal directly with their employees? Why create a middle man? Middle man in any economic system tend to destroy wealth. Uber is in itself a middle man between people who want a ride and people who pay for it. They upended a middle man who was less efficient.

Don't see where parent is saying anything about Labor from a central org. He's just saying Uber has to up their bid in order to win the services of said Labor.

Because of the problem of how to decide how they labor is used. Central planning communism has never worked. Free market with regulation and taxation has a much better record.

The person decides how their labour is used. They take a guaranteed job or they take a private job.

The private job then just has to be better than the guaranteed one and they will get the labour.

Where's your central planning in that?