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Average Cost Flow Assumption. A calculation used by companies to monitor inventory goods. The average cost flow assumption is one of a variety of cost flow assumption methods used to determine the cost of goods sold (COGS) and ending inventory. Companies use one or more methods to make certain assumptions regarding which goods have been sold and which remain in inventory.
1 The periodic method of inventory involves doing an inventory count at the end of each period, then mathematically calculating Cost of Goods Sold. 2  FIFO (first-in, first-out) is the assumption that the oldest units of inventory are sold before the newer units.nder the âFirst-In, First-Outâ method of calculating CoGS, we assume that the oldest units of inventory are always sold first. So in the above example, weâd assume that Maggie sold all of her $3 shirts before selling any of her $3.50 shirts.