A: Do you want to come with me to Walmart? B: What do you need to buy? A: I'm out of groceries. B: Groceries are expensive at Walmart! A: You really think so? B: Yes! You should buy groceries at the market. A: I also need some new blankets. B: Well, you'd buy that at Walmart. A: If Walmart sells both, why go to different stores? B: You'll save money if you do. A: Why will I save money by going to different stores? B: Stores have different prices for different things.
