A local shopkeeper has been doing business with Imogene for years. Imogene is a caretaker for an elderly woman in town, and she is authorized to purchase groceries and other goods in the store on the elderly woman's account. One day, a man named Andrew comes to the store and claims to be the elderly woman's new caretaker. He charges groceries to her account and leaves. The elderly woman later refuses to pay those charges, asserting that she doesn't know an Andrew. Is Andrew personally liable for the charges