It's also not an economic one. My salary is locked in. So long as I don't get fired, I get paid the same. So I can give different outputs and get paid that same "premium price." Just have to meet the bar. So it's in my interest to reduce how much work I do in order to increase my de factor hourly rate. If you factor in promotions etc, it's the same thing - just a different bar.
I guess you could say I'm offering a "premium product" either way and be right, but my original point stands. I don't need to be giving 100% to get that money. And the longer I'm at a job, the more I can understand the effort bar I need to meet and influence it downward.