Sharon, a noted collector of fine glass, found a rare glass vase in a secondhand store in a small town she was visiting  The vase was priced at $10, but Sharon knew that it was worth at least $1, 000  Saying nothing to the storekeeper about the value of the vase, Sharon bought the vase for $10  Weeks later the storekeeper read a newspaper article about Sharon' s collection, which mentioned the vase and how she had acquired it
When the irate storekeeper later accused Sharon of taking advantage of him, Sharon replied that she had done nothing wrong
The obligations that follow from any social relationship between two people who are well acquainted override any obligations that follow from an economic relationship between the two.