Why is closing stock commonly valued using weighted average cost?

• A. To reflect the most recent purchase price.
• B. To reflect current market value.
• C. To comply with tax rules.
• D. To smooth price fluctuations over the period.

Answer: (D)

The idea being tested is using a weighted average cost to value closing stock in order to smooth price changes over the period. By averaging the cost of all units available for sale during the period, you assign one unit cost that reflects the overall spending on inventory rather than tying value to a single purchase.

In practice, you combine opening stock with all purchases to get total cost and total units available, compute the average cost per unit, and then value the ending inventory at this average cost. Because that single cost comes from the entire period, the effect of any price spikes or drops is spread out, leading to more stable cost of goods sold and ending inventory across the period.

Other methods tie inventory value to a specific batch or current market value, which can exaggerate the impact of price fluctuations or shift value with every new purchase. Weighted average smooths those fluctuations, which is especially helpful when many similar items are bought at different times.