Answer:
Accept the high price
Explanation:
Since the customer values the item at $60.
And the shopkeeper quoted a high price at $50.
The high price quoted by the shopkeeper is ($60 - $50) $10 less than the customer estimated value of the item.
He may decide to walk away from the deal but that's not the best option because the quoted price is not up to his estimated price.
So, the best to do at that point is to accept the high price of the item at $50