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:
Vomiting
The forceful expulsion of stomach contents through the mouth.
Enteric
Relating to or occurring in the intestines.
Thrombosis
The formation of a blood clot inside a blood vessel, obstructing the flow of blood through the circulatory system.
Embolism
An obstruction in a blood vessel due to a blood clot or other foreign matter being carried in the bloodstream.
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