without regulation

Well, markets don't exist in a vacuum, of course, they need a reasonable framework of law and order. Just to start with you need property rights and the ability to enforce contracts.

tragedy of the commons, negative externalities, etc.

That's a different thing that doesn't have much to do with the markets ability to deal with resource scarcity.

You keep pointing out that markets are not Jesus and they don't automagically solve all humanity's problems. Yes, yes, of course, but no one is arguing that. We're talking about a fairly specific problem -- dealing with resource scarcity -- and you keep on bringing up how markets don't solve violence and pollution...

Why not?

I expect the population to reach a plateau and stabilize at some point. I do not expect that plateau to be the capacity level of the planet.