The more people present at a scene, the less likely it is that anyone will help a person in need. this phenomenon is a manifestation of the diffusion of social responsibility.
Altruism is selfless concern for the welfare of others. - We are most likely to help if we (a) become aware of the incident, (b) interpret it as an emergency, and (c) accept responsibility for helping. Other factors, such as our mood and our similarity to the victim, also influence our willingness to help.
The tragedy phenomenon occurs when an individual consumes more than his share and the cost is shared by all, causing the ultimate collapse of the commons - tragedy. A game whose results do not have to sum to zero.
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