The main mental errors are the following: Escalation It is an error committed by businesspeople when they get into competitive negotiations. It can also be considered as “over-commitment”. What causes it: people’s ego and competition mainly How to avoid it: Consciously know which are the alternatives to the deal beforehand and be objective Partisan Perceptions It is psychological phenomenon that causes people to misperceive the world and one particular situation. Good negotiators know how to avoid this. The know its existence, they visualise the other side’s position use analogy to frame the problem and do not hesitate to bring a neutral third party for guidance. Irrational Expectations ...