What is the primary difference between perpetual and periodic inventory systems?

What is the primary difference between perpetual and periodic inventory systems?

• A. Perpetual systems update the inventory account only at regular intervals, while periodic systems continuously update the inventory account.
• B. Perpetual systems are simpler to set up compared to periodic systems.
• C. Perpetual systems provide real-time inventory visibility, while periodic systems lack real-time tracking.
• D. Perpetual systems calculate the cost of goods sold at the end of the accounting period, while the periodic systems record it immediately.

Answer: (C)

The main idea is how each system handles updating inventory and showing stock in real time. In a perpetual inventory system, every sale and every purchase updates the inventory balance and the cost of goods sold immediately, so you always have a real-time view of on-hand stock. In a periodic system, updates to inventory aren’t made with each transaction; instead, purchases go into a purchases account and the actual inventory balance is only adjusted at the end of the period after a physical count. COGS is then calculated for the period using Beginning Inventory + Purchases − Ending Inventory. That’s why the correct answer emphasizes real-time visibility: perpetual systems continuously reflect current stock levels, while periodic systems do not provide real-time tracking. Why the other statements don’t fit: perpetual systems don’t update only at regular intervals; they update continuously. Perpetual systems are not necessarily simpler to set up; they’re typically more complex and often costlier to implement. Finally, perpetual systems don’t calculate COGS at the end of the period; they record COGS at the time of each sale, whereas periodic systems determine COGS after the period ends.

The main idea is how each system handles updating inventory and showing stock in real time. In a perpetual inventory system, every sale and every purchase updates the inventory balance and the cost of goods sold immediately, so you always have a real-time view of on-hand stock. In a periodic system, updates to inventory aren’t made with each transaction; instead, purchases go into a purchases account and the actual inventory balance is only adjusted at the end of the period after a physical count. COGS is then calculated for the period using Beginning Inventory + Purchases − Ending Inventory.

That’s why the correct answer emphasizes real-time visibility: perpetual systems continuously reflect current stock levels, while periodic systems do not provide real-time tracking.

Why the other statements don’t fit: perpetual systems don’t update only at regular intervals; they update continuously. Perpetual systems are not necessarily simpler to set up; they’re typically more complex and often costlier to implement. Finally, perpetual systems don’t calculate COGS at the end of the period; they record COGS at the time of each sale, whereas periodic systems determine COGS after the period ends.