How does Troy’s and Rose’s philosophy differ when it comes to where they shop?

Rose Maxson enters and she and Troy reminisce about how she won him for a husband though he hadn't been a marrying type. They argue about shopping at the A&P, which is cheaper, or at the local shop Bella's, which is a part of the community. Rose says the A&P is cheaper than Bella's where as Troy claims he is treated better at Bella's.