Brain ScienceSocial psychology studies the mind in the crowd, complex part of human relationship. Environmental psychology studies the relationship between an individual and the environment.
"Free riders" and "social dilemma" are important key-words in both social psychology and environmental psychology.
Free rider is the people who do nothing but get benefit of action of other people.
There are some definitions. Social dilemma is a phenomenon that no-cooperation is better individually but cooperation of all people is better socially.
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