Beware of the defeatism imported by pretending these problems are intractable.

Markets are conversations when the participants are relatively equal. Barter and informal commerce in voluntarist/anarchist communities would be somewhat close to a pure example. Power relationships can be thought of as external to markets but markets are certainly influenced by them very heavily.

Hyperlinks do create hierarchy but for the network effect reasons I discussed. I also think the hierarchical nature of the DNS system is a culprit. I prefer non-hierarchical cryptographic addressing for this reason, but it has yet to see a mainstream implementation.

I agree that nobody is immune to advertising. You're right about that one. I didn't highlight it as different from the others.