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
A buyer's sole obligation to a seller is to pay in full the price that the seller demands for a piece of merchandise that the buyer acquires from the seller.