There's no need for any "central authority."
Of course there is; business will try to pay as little as they can, and some people (like me) will accept less than others for equal or greater performance, so strong authority would be needed to make business do what you want, and it needs to be a centralized authority so that it's uniform.
I can fully appreciate why the Left is enamored with dictatorship and other totalitarian forms of govenment; because it's the only way to ensure equality is imposed on an innately unequal reality.
So you're now in favor of unions so workers can get paid whatever they can get?
Absolutely. It's our frickin' freedom of association. If I want to get together with some others and pursue shared interests in bowling, it's my right. And if I want to get together with some others and pursue shared interests in our workplace, it's my right as well. If the bowling alley down the street doesn't like us, they can kick us out. Same with a shared employer. Because it's also their right to rent shoes and lanes and have whoever working there they want.
The idea of unions are as American as apple pie, independent of the major ones having been taking over by communists, back when the Left in America was still pursuing the remaking of America by way of getting the workers to revolt (having switched some time ago to pursuing the same by way of deception instead of honest argumentation).
And independent of some of them being so stupid as to drive their reason for being out of business! And independent of, what for lack of a better term I'll call cronyist labor; the corruption that is government involvement like denial of right-to-work and denial of the secret ballot.
In short, unions are like journalism, education, government, etc.; they're all fine and important in principal, it's just that ours have all been corrupted by the Left (who've turned them all from their actual roles into primarily about advancing Leftism). Otherwise I'm not anti- any of those things.