Which of the following influences people's buying plans and does not shift the demand curve?

The supply curve for watches

A) is downward sloping. B) shows the relationship between the quantity of watches firms are willing and able to supply and the quantity of watches consumers are willing and able to purchase. C) shows the supply of watches consumers are willing and able to buy at any given price. D) shows the relationship between the price of watches and the quantity of watches supplied.

Some charge that third-degree price discrimination is unfair or that it reduces social welfare. Why does charging one group a lower price hurt anyone?

What will be an ideal response?