Name the hard-bargaining tactic and clarify that you will only engage in a reciprocal exchange of offers.
Business negotiators can negotiate by brainstorming creative solutions, identifying differences in preferences that can be ripe for tradeoffs, and building trust.
Guhan Subramanian is the Professor of Law and Business at the Harvard Law School and Professor of Business Law at the Harvard Business School.
Here is a blog I recently wrote discussing that sort of preparation and education.