That's-Not-All Technique
Also called that's not all, improving the deal
Adding something to an offer before the person has responded makes them more likely to accept it.
The that's-not-all technique improves an offer, by adding an item or lowering the price, before the person has had the chance to say no. The improvement feels like a concession made to them, which invites reciprocity, and it sets the final offer against the less attractive one that came first.
A bonus announced after the main offer, an upgrade included before the customer decides, a discount applied during the conversation rather than printed up front.
The addition should be real value. Inflating a base price so that a 'bonus' can be announced is a deception, not a concession.

Know the terms. Now measure your own influence.
The Influence Assessment shows which of the seven principles you already use well, and which one is costing you.
