Considers cooperative negotiation tactic use in early stages of business-to-business buyer-seller relationships. Specifically, it addresses a serious gap in the study of individual difference effects on cooperative negotiation, an area that has received little academic attention. In doing so, insight is provided on an area that marketing researchers say needs attention now. We conduct a study where subjects take the role of a salesperson. They make offers, or respond to buyers ' offers, to negotiate. Subjects indicate what offers they would make, or what counteroffers they would respond with. Results support the notion that individual differences in intrinsic motivation (operationalized as autonomy causality orientation) affect the use of cooperative offers, but do not affect counteroffers, due possibly to reciprocation.