Which inventory concept results when it is economical to purchase or produce in larger lots than needed for immediate use due to quantity discounts or setup costs?

• A. Lot-for-lot
• B. Lot-size inventory
• C. Economic order quantity
• D. MRO supplies

Answer: (B)

Lot-size inventory is about ordering or producing in fixed, larger batch sizes to take advantage of economies of scale—such as quantity discounts or spreading fixed setup costs over more units. By purchasing in bigger lots, the per-unit cost drops enough that the overall cost, including carrying some extra inventory, is minimized. This approach intentionally stockpiles more than the immediate usage because the savings from discounts or reduced setup costs outweigh the extra carrying costs.

Lot-for-lot would avoid these bulk savings by ordering only what’s needed each period, keeping carrying costs very low. The Economic Order Quantity concept is the pricing model that finds an optimal batch size based on a balance of holding and ordering costs, which can align with this idea but describes the calculation itself rather than the policy of stocking larger lots to capture discounts. MRO supplies are simply a category of items and not the policy described here.