The Owner of a sports memorabilia shop had to leave for a few hours so he asked an inexperienced friend to cover for him

The Owner of a sports memorabilia shop had to leave for a few hours so he asked an inexperienced friend to cover for him. While the owner was gone, a child came in and paid $10 for a rare card that was actually priced at $1,000. The friend had wrongly assumed that there was a decimal point. When the owner learned of the mistake, he went to the boy's home. The father refused to return the card. "Tough luck, " he said. "A deal's a deal."

a)      Examine separately the viewpoint of each of the people involved (shop owner, friend, boy and father)? 

b)      What is your opinion?

c)      If you disagree with the father, how do you think this should be resolved?

A superficial answer is not expected. I anticipate considerable thought being in your response.