You can do anything! - sh.itjust.works

If by “value” you mean income it isn’t even tied to individual productivity. It’s tied to how much power or leverage you have to demand more.
In theory it’s both. But mostly the leverage one.
Producing value gives leverage. A salesman who brings in lots of revenue and profit can negotiate a pretty high commission, because controlling that level of revenue/profit represents some leverage.
Kindly reminds me how much value a salesman produce?
To the person he exercises leverage over, who makes money on each sale made, and pays his wages/commissions? Isn’t that obvious? He agrees to sell some stuff, in exchange for money that comes from the sale.