Law of supply and demand is the first thing that would come to mind when talking about the price of stuff. If you want to cheapen things out, especially commodities like food items and perishables, you gotta make them or produce them more than what you would normally. This would create a surplus supply, and in order to make sure it sells out you'd drop the price of the goods which will be great for the people. Another would be the price of oil. Should we find a way to effectively rollback the price of oil and fuel, logistics wouldn't be so expensive anymore which is also one of the primary factors why produce is so expensive, with a cheaper transportation fee, vendors can sell these goods at a cheaper rate.