FIFO and LIFO are inventory management methods used to track the cost of goods sold and inventory levels.
FIFO assumes that the first items purchased are the first sold, while LIFO assumes that the last items purchased are the first sold.
In times of rising prices, LIFO results in higher cost of goods sold, lower reported income, and lower taxes, while FIFO has the opposite effect.
In times of falling prices, the results are reversed, with FIFO resulting in higher cost of goods sold and lower income, and LIFO having the opposite effect.