Devon Cartagena, a dealer in antiques, sees a desk for sale for $50 at a garage sale and recognizes it as a Louis XV desk worth $15,000. Does he have a legal or ethical obligation to disclose the true value to the person holding the garage sale? Should it matter that difficult financial circumstances made it necessary for the homeowner to sell the desk? Should Cartagena get some reward for the effort he has spent in becoming an expert in antiques and for the time he has spent pawing through junk at countless garage sales?

A person recently sold a map for $3 that later turned out to be worth more than $19 million. Does the buyer have a moral duty to share the windfall with the seller? Would the seller have a moral duty to share the loss if the buyer paid $19 million for a map worth only $3? What if a framed picture sold for $25 turns out to have an original copy of the U.S. Constitution behind the picture? Is this a mistake of judgment or of fact? What, if anything, is the buyers ethical responsibility to the seller in such a case?