Which statement about par levels is true?

• A. They are set only by supplier recommendations.
• B. They are fixed for the year regardless of usage.
• C. They incorporate usage rate, lead time, and safety stock.
• D. They incorporate seasonal demand patterns in addition to usage.

Answer: (C)

Par levels are the target quantities you keep on hand to ensure smooth operations, calculated from how quickly you burn through items, how long it takes to get more, and a safety buffer to cover variability. The best answer reflects this because you determine reorder points by using the usage rate (how much you consume over a period), the lead time (how long replenishment takes), and a safety stock to prevent stockouts if demand spikes or deliveries are delayed.

Supplier recommendations alone don’t capture your actual usage or potential fluctuations, and a fixed number for the whole year ignores changing demand and delivery reliability. Seasonal adjustments can be useful, but the core concept that defines par levels is the combination of usage rate, lead time, and safety stock, which is why this option is the most accurate.