A question raised by Van Kleef et al. based on these findings was whether expression of emotion influences others, since it is known that people use emotional information to conclude about others' limits and match their demands in negotiation accordingly. Van Kleef et al. wanted to explore whether people give up more easily to an angry opponent or to a happy opponent. Findings revealed that participants tended to be more flexible toward an angry opponent compared with a happy opponent. These results strengthen the argument that participants analyze the opponent's emotion to conclude about their limits and carry out their decisions accordingly.