The Wilsons asked their family doctor for advice about their 4-year-old daughter, Jenny, who was exhibiting tantrums whenever she went to the store with her parents. The doctor asked a number of questions and determined that Jenny's tantrum behavior in the store was reinforced by getting candy or other items that she saw in the store. Typically, Jenny would see an item and ask for it. When her parent said no, Jenny began to scream and cry until eventually the parent got the item for her. The doctor instructed the parents to use extinction to get Jenny to stop her tantrum behavior. He said that the next time Jenny engaged in tantrum behavior in the store, the parent should ignore it. He instructed the parent not to buy the item that Jenny wanted but to keep on shopping as if nothing was wrong. What is the problem with this advice?