In
accounting, a technique for
valuing inventory by treating inventory acquired first as if it were sold first. The
sale of inventory is recorded against the purchase
price of the oldest inventory, even if the physical goods are not the same. In times of high
inflation, the first-in, first out technique increases a business'
inflation risk. For this reason, most American firms have used the
last-in, first-out technique in their accounting since the 1970s.