I was best across the table, reading the other side, finding the number that worked for both of us. Now I lead the procurement team, and I answer for the savings through other people's negotiations. I sit in reviews watching deals I'd have closed differently, my own hands nowhere near the table.
More people experience this than they realize.
You answer for the deals through others instead of negotiating them yourself.
If this sounds familiar, the Library can help you find the bigger picture.