If facilitated correctly, Knot or No-Knot is a very powerful exercise for practicing negotiation and argumentation skills

Bigger and Better is a negotiation and team building activity in which teams compete by trading ordinary objects

The ability to persuade people is an argumentative skill. The out of the circle is a exercise as it engages everyone in a powerful scenario.

The barter puzzle is a good activity if you want team members to solve problems, practice strategies and negotiation skills