3. Why does Vladek make the trip to the grocery store? Why is this trip interwoven with his story of the journey from Auschwitz back to Germany?

"They arrive at the grocery store. Vladek wants to return some opened and partially-eaten food, and Art and Francoise wait in the car, embarrassed and unwilling to participate. They see Vladek and the manager shouting at each other through the store window. Eventually, though, he returns to the car victorious, having received six dollars of groceries for only one dollar. He tells his son that the store manager was happy to help once he told him about the Holocaust, Mala's departure, and his current poor health."