The correct option is B. First-In, First-Out (FIFO). Explanation of the Correct Answer First-In, First-Out (FIFO) is an inventory valuation method that assumes that the oldest inventory items are sold first. This means that when a company sells its products, it is selling the items that were purchased or produced first. How FIFO Works:

1. Inventory Flow: Under FIFO, the cost of goods sold (COGS) is calculated based on the cost of the oldest inventory. For example, if a company has inventory purchased at different prices over time, when it sells items, it will first account for the cost of the oldest items.
2. Impact on COGS: In periods of rising prices, the older inventory (which was purchased at lower prices) is sold first. This results in a lower COGS compared to other methods like LIFO (Last-In, First-Out), where the most recently purchased (and typically more expensive) inventory is sold first.
3. Financial Statements: Because FIFO results in a lower COGS during inflationary periods, it leads to higher gross profit and net income. This can also affect tax liabilities, as higher profits may lead to higher taxes.

Why the Other Options Are Incorrect A. Last-In, First-Out (LIFO): - LIFO assumes that the most recently purchased inventory is sold first. In periods of rising prices, this means that the COGS will be higher because it reflects the cost of the latest (and more expensive) inventory. This is the opposite of FIFO, which is why LIFO is not the correct answer. C. Weighted Average Cost: - This method averages the cost of all inventory available for sale during the period and applies that average cost to the COGS. While it smooths out price fluctuations, it does not specifically assume that the oldest inventory is sold first. Therefore, it does not directly address the question regarding the impact of selling the oldest items first. D. Specific Identification: - This method tracks the actual cost of each specific item sold. It is typically used for unique or high-value items (like cars or real estate) rather than for large quantities of similar items. It does not assume any particular order of sale (oldest or newest), making it irrelevant to the question. Example Calculation To illustrate FIFO, consider a company that has the following inventory purchases:

• 100 units at $10 each (oldest)
• 100 units at $12 each
• 100 units at $15 each (newest)

If the company sells 150 units, under FIFO, the COGS would be calculated as follows:

• First, sell 100 units from the oldest inventory: 100 units x $10 = $1,000
• Then, sell 50 units from the next batch: 50 units x $12 = $600

Total COGS = $1,000 + $600 = $1,600. If the prices were rising, the COGS would be lower than if the company had used LIFO, which would have resulted in a higher COGS based on the more expensive inventory. Common Pitfalls

• Confusing FIFO with LIFO: Students often mix up FIFO and LIFO. Remember, FIFO sells the oldest inventory first, while LIFO sells the newest.
• Not considering inflation: When discussing the impact of inventory methods, always consider the economic environment, such as rising prices, which can significantly affect financial outcomes.

Revision Summary

• FIFO assumes the oldest inventory is sold first, impacting COGS during rising prices.
• It results in lower COGS and higher profits in inflationary periods.
• LIFO, Weighted Average Cost, and Specific Identification do not follow the same principle as FIFO.
• Understanding the implications of each inventory method is crucial for financial reporting and tax calculations.