Individuals are more willing to use deceptive tactics when the other party is perceived to be uniformed or unknowledgeable about the situation under negotiation; particularly when the stakes are high.

Some of the key ethical considerations in negotiation include: honesty, respect, fairness, responsibility, and confidentiality. 

Ethics in negotiation can also include:
Avoiding complicity in wrongdoing
Noticing and calling out the unethical behavior of others