What is the most likely explanation for a congressional district to change shape?

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society

Steven pinker states that an important difference exists between men and women in:

Atraffic cop has pulled over a speeder, only to discover that he has stopped a close friend. the police officer is torn, because his professional obligations demand that he punish the speeder, but his personal obligations suggest that he should give a friend a break. what is this called?