The following information is for a public good.Pa and Pb are the prices that individuals A and B are willing to pay for the last unit of a public good, rather than do without it.These people are the only two members of society.The collective willingness of this society to pay for the 2nd unit of this public good is: 
Definitions:
Trait Theory
A psychological perspective that focuses on the identification and measurement of consistent personality characteristics (traits) that vary among individuals.
Allport
Refers to Gordon Allport, a psychologist known for his theory of personality that emphasized the uniqueness of the individual and the concept of personal traits.
Personality
An individual's distinct and consistent patterns of feeling, thinking, and behaving.
Functional Autonomy
A concept introduced by psychologist Gordon Allport, suggesting that some behaviors might start with an external motive but become self-sustaining or autonomous over time.
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