Labor markets are not capitalism. A commodity production system using prices for exchange with productive instruments under private ownership is capitalism.
If we define capitalism to mean "anything that supports my argument" then yeah, of course you're right.
> For example, the doctors guild could say that surgery costs a million dollars.
And they would have exactly zero customers and go bankrupt, because another competing doctors guild would do the surgery because they value saving lives over driving luxury cars. Labor market.
> Does that mean that surgeries objectively costs a million dollars?
If you paid it, then it objectively cost that much when you paid it, no?
> But what that regulation looks like isn't objective in any way, and it will shape the prices you will see, so labour prices are subjective.
Yeah, labor prices are subjective. Observed labor, performed at a specific price, performed over a specific time, is objective.
How much labor and what amount of resources and what processes took place to transform those resources for any given product is very much objective. These values might change over time as some labor becomes more costly or resources become more scarce than others, but that doesn't change that there is an objective measurement to what it cost to make some thing. Not some thing that might exist in a day or a week, but some thing that already exists.
You can thump your subjectivity bible all you want, but you're wrong.