in a period of increasing prices which inventory flow
1 Income effect-Inventory and cost of goods sold are interdependent. 2  As a result, if LIFO method is used in a rising-price and increasing-inventory environment, more of the higher-cost goods (last ones in) will be accounted for in COGS as opposed to FIFO.IFO will use the cost of the old stock to determine the COGS, making the profitability ratio less reflective of the current economic reality. As a general rule, in a rising-price and stable-or increasing-inventory environment,using profitability measures based on LIFO is better.