Final answer:
The described system is a Reorder Point Inventory System, where a set inventory level triggers an automatic reorder of Pop Tarts when the stock falls below 20 boxes.
Step-by-step explanation:
The inventory management system described in the question is a Reorder Point Inventory System. In this system, a specific level of inventory is set as the reorder point, which, in this case, is 20 boxes of Pop-Tarts. When the inventory falls below this level, an automatic reorder is triggered, which in this case is for 100 boxes. This system helps prevent stockouts by ensuring that inventory is replenished before it reaches critically low levels, but it does not involve the just-in-time delivery of goods or calculations for economic order quantity.