We utilize several different sales software systems to maintain the optimum amount of inventory in Amazon fulfillment centers at any given time. We calculate this based on sales velocity over several different windows. Have a slow week, and then sales skyrocket the week after? Don’t worry – we’ll have the data for sales over both the entire two week window as well as the high-sales week to make sure there are no stalls in the supply chain, and your customers will always be able to order your product without the wait because stock ran out.