We have sewers and a treatment plant wear I live. How would you make that happen in your silly society. We just had a new bridge built and expanded our transit system. How does that happen?

The people who value it will pay for it. If they don't what is the justification for forcing people who do not value it to pay?

The only justification needed is the collective good. That is the future. The selfish actors are destined to lose in the world that is coming. The theory you are pushing is a last grasp idea of a dying system. Your arbitrator will often just side with the person that pays more.

If the collective good were served by torturing one individual continuously for the rest of his life, would that torture be justified?

That is a silly question. There is no circumstance that would fit that criteria

But you are arguing for the supremacy of a collective good. The difference is only a matter of degree. How much are you willing to violate another person to achieve your ends?

With your ideaolgy we all compete with one another as the rich use more and more machines making it harder for us to earn money. Leading to a rather dystopian future.

What prevents someone from just offering goods or services to the public?

Mad Max fighting for scarce resources with each other. Or Star Trek, were we pursue knowledge, make art, philosophize, enjoying the world and each other. One path is competitive the other is co-operative.

Without competition there is no efficient way to determine where scarce resources should go.