The phrase "large quantities" refers to a significant amount or great number of something. It can be used in various contexts, such as describing large amounts of goods produced or consumed, a large quantity of data collected, or a large number of people present at an event. The term implies that the quantity is more than what would typically be considered normal or expected, and it often suggests that the amount is substantial enough to have an impact on something else, such as the market price or availability of resources.