Answer the question based on the following information for a public good. Pₐ and Pᵦ 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:
Costovertebral Angles
The anatomical areas on the back formed by the junction of the ribs and the vertebral column, examined for tenderness indicating kidney pathology.
Kidney Inflammation
Also known as nephritis; a condition in which the kidneys become inflamed, potentially affecting their functioning.
Liver Enlargement
An increase in size of the liver due to various conditions like hepatitis, fatty liver disease, or cancer.
Esophageal Reflux
The backward flow of stomach acid into the esophagus, causing heartburn and potential damage.
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