The reason a small unexpected concession buys goodwill cheaply

Halfway through, one side volunteers a two-week extension nobody asked for. It costs almost nothing operationally. For the rest of the negotiation the other side behaves as though a debt exists, and the debt is larger than the extension.

What everyone sees

Concessions are priced by what they cost the giver, which is how they appear in an internal approval memo. The receiver has no access to that figure. They price the concession against their expectation, and an unrequested one arrives with no expectation to be measured against.

What is actually happening

Gouldner’s formulation of the reciprocity norm holds that a received benefit creates an obligation to return one, and that the obligation is generalised rather than itemised — the return need not match the original in kind or in magnitude. Regan’s experiment showed the effect operating independently of liking: participants who received an unrequested small favour complied more with a later, larger request, and compliance did not depend on how much they liked the person who gave it. Applied here, the value of an unrequested concession comes from two sources at once: it is unexpected, so it is measured from zero, and it creates an unpriced obligation. Neither source has anything to do with the cost of the item conceded.

Why it stays hidden

The asymmetry hides because both parties describe the same event in their own currency. The giver records a low-cost item conceded, files it under goodwill, and forgets it. The receiver records a favour, holds it, and repays it later at a price the giver never quoted — with each side’s books internally consistent and mutually unintelligible.