Mere Exposure Effect

tendency for novel stimuli to be liked more or rated more positively after the rater has been repeatedly exposed to them

requires that the stimulus is not incessant

 Matching Phenomenon

The tendency for men an women to choose as partners those who are a "good match" in attractiveness and other traits

intellect, values, interests, etc.

Egoism

An underlying motive for behavior to increase one's own welfare.

The opposite of Altruism

Explaination by labelling

Reciprocity Norm

Expectation that guides behavior that suggests we help others who have helped us in the past

If you don't go to someone's funeral, they won't come to yours.

Tragedy of the Commons

Individuals begin to consume more than their share of a common resource.

The result is the loss of the resource for everyone.

Social Trap

Situation in which conflicting parties tend to pursue own self-interest although cooperation would have led to a better outcome.

E.g. Prisoner's Dilemma