[Solved] The least expensive way to clean up the environment is for all firms to reduce pollution by an equal percentage. Hot And Cool Media: Terms introduced by Marshall McLuhan to describe media's effects on society, where "hot" media require less audience interaction, and "cool" media require more. Mass Media: Forms of communication, such as newspapers, radio, and television, that reach a large audience. Social Interaction: The dynamic, reciprocal exchange of actions and reactions among individuals and between individuals and their environment, which forms the basis of social relationships. Pornography: Material that depicts sexual content explicitly for the purpose of sexual arousal.