a store employee holds up one of the last smartphones from a nearly empty display shelf. Eager customers reach forward with their hands extended, trying to grab the final available units. The shelf behind the employee shows only a few remaining boxes where there were once many products stacked high. Empty spaces on the display clearly show where popular items have already been sold out. Disappointed customers in the background shake their heads as they realize they arrived too late. Other shoppers hurry toward the counter hoping to secure one of the remaining devices. products being available only for as long as the current stock lasts