Based on the description and personal experience I would classify this as being Peer Pressure. Which is a common occurrence in schools, where younger children and adolescents are convinced (usually by people they look up to or admire) into doing things that they have been taught their whole lives not to do or to be careful about. Usually they are taught by the parents, teachers, or people who have been through these situations, yet they still succumb to Peer Pressure because they want to fit in with the people they admire.
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Yes, Ben's actions are unethical because he is CEO´s friend and through this friendship he can have privileged stock market information that other persons do not have.
