Answer the question on the basis of the following information 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 second unit of this public good is
Definitions:
Group Development
The phases or stages through which a group progresses as it matures, including forming, storming, norming, performing, and adjourning.
High Performance
A state of achieving or exceeding the expected or required standards in a specific task or field.
U.S. Hockey Team
Refers to various ice hockey teams representing the United States in international competitions, including the Olympic teams and World Championship teams.
Stage Of Development
A period in the growth or evolution of something, often used to describe phases in human psychological or physical growth.
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