Consider a game in which each of three men is given $20. All three must secretly decide whether they will contribute any part of their $20 to a trust fund. At the end of the game, each player will receive 40% of the total money contributed to the trust fund, in addition to any of the remaining $20 that he is holding. 
Definitions:
Cognitive-behavioral Therapy
A type of therapy focusing on improving well-being and solving issues through altering negative emotions, actions, and thought patterns.
Phobias
Intense, irrational fears of specific objects or situations, leading to significant distress and avoidance behavior.
Compulsions
Repetitive behaviors or mental acts that an individual feels driven to perform in response to an obsession or according to rules that must be applied rigidly.
Psychoanalysis
A set of theories and therapeutic techniques related to the study of the unconscious mind, developed by Sigmund Freud, focusing on resolving mental conflicts.
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