We're nowhere near any common definition of what a fair wage should be. Especially for knowledge workers whose work ain't easy to value. Say I build some engin

We're nowhere near any common definition of what a fair wage should be. Especially for knowledge workers whose work ain't easy to value. Say I build some engine and buy a bunch of identical bolts I need: each one obviously costs the same. But now I'm building a business and need some human cogs to run it, why would I have to discuss the particular cost of each one? Same work, same pay. But... unique person and custom pay? How do we reconcile this apparent contradiction?