Answer:
Ruth keeps account of her family's expenses. She keeps track of the entire family's needs and discusses with other family members about what products need to be bought. She realizes that the family requires a bigger refrigerator and discusses this with her parents. She collects information about refrigerators from various brands so that her parents can make an informed decision.
Purchaser
Step-by-step explanation:
Her parents does the purchase so she needs to inform them about the latest to be bought.