Which term describes an agreement among competitors about their relationships with customers after contacting them?

The term that best fits the description of an agreement among competitors regarding their relationships with customers after contacting them is collusion. Collusion refers to a secret or illegal cooperation or conspiracy, especially in order to cheat or deceive others. In a selling context, it can involve competitors working together to manipulate market conditions or customer interactions, which may lead to unethical practices that undermine fair competition.

While collaboration generally emphasizes working together for mutual benefit, it is often considered legitimate and ethical in nature, typically involving cooperation in a way that is transparent and compliant with laws and regulations. Conspiracy implies a secret plan, which can suggest illegal actions, but it does not specifically highlight the aspect of customer relations as directly as collusion does. Cohesion refers to the act of forming a united whole, which does not specifically relate to competitors agreeing on customer interactions. Therefore, collusion accurately represents the agreement in question.