[neilwilson]

"How much money you make is, properly, strictly a conversation between the parties in the transaction."

No it isn't - because it allows you to command more of society's resources for yourself over others.

So it is very much a matter for others - and you have to justify yourself to them because you want them to make stuff for you.

If you are paid more than me, and I think I'm worth more than you I will make my case or test the job market to see if I'm right.

Relative value is exactly what the world is about. That's why prices in stock markets are published.