On a recent trip to the grocery store, Greg bought a bag of his favorite brand potato chips. On the shelf next to them, he saw a new flavor. While it looked interesting and it might be a flavor he would try some time, today he was more interested in getting his usual bag. After paying for the large bag of chips and heading home, Greg started thinking about how expensive the chips were. He thought he could certainly make his own at home for a lot less money. Greg wondered why the bag of chips had to cost so much. How would you explain the price to Greg?