What are the various methods through which individuals can engage in business transactions where payment or goods are exchanged upfront, with the agreement set at a fixed or reduced price? The Gemara delves into diverse scenarios, providing rulings on the permissibility, prohibition, or contentious nature of each. In some documented instances, Rabbis faced accusations of involvement in transactions resembling usury. Yet, on each occasion, they provided clarifications demonstrating why such actions did not constitute usury.