Answer:
customers to buy expensive products using credit and installment loans offered by banks
Explanation:
Given that an installment loan is a term that describes a form of financial services whereby the borrower is enabled to borrow a certain amount of money, which will surely be refunded at a scheduled rate in a given period. It is generally used for a specific purchase which is often considered to be expensive.
Also, a credit card is a form of financial services that enable cardholders to borrow money for the payment at a point of sale with vendors or retail stores that receive cards for payment.
Both financial services are arrangements between Banks and retail stores.
Hence, given the available options, it can be concluded that Banks and retail stores created agreements that allowed "customers to buy expensive products using credit and installment loans offered by banks"