Final answer:
The manager assumes the role of a negotiator when meeting with another company to discuss a joint venture.
Step-by-step explanation:
The manager assumes the role of a negotiator when he meets with a manager from another company to discuss the possibility of entering into a joint venture together. As a negotiator, the manager will engage in discussions, make proposals, and work towards reaching an agreement that benefits both parties involved. This requires effective communication, persuasive skills, and the ability to find common ground.