The price of producing a $4 chocolate bar goes up, so the seller of the chocolate bar raises the price to $5. A student describes the effect on the demand for the chocolate, saying, "Since the price goes up, the quantity demanded will go up." Evaluate the student's answer.

This is incorrect (what the student is saying) obviously the quantity should be bigger to be worth the $5 dollars you are spending. But what it is saying is since a chocolate bar once sold for $4 is taking more money to produce they need to raise the price so that they earn money as well. If they are spending all the money that they earn from that $4 chocolate bar then they earn nothing and business goes down.