Final answer:
SMG Co. would use the Lower of Cost or Market rule to decrease the value of its inventory items to their lower fair market value.
Step-by-step explanation:
SMG Co. would decrease the value of its inventory to the lower fair market value under the rule of Lower of Cost or Market. This rule requires a company to compare the cost of inventory with its market value and record the lower value as the inventory value. If the market value is lower than the cost, the inventory value is decreased to reflect the decline in value.