Since fixed production overheads are allocated with the production cost per unit there is also the risk of under or over absorption if the actual overheads are different than the budgeted or the actual production differs from the estimated one . The activity based costing system still includes fixed overheads in inventory like the absorption costing method . The main difference between these two methods stems from how are overheads apportioned . Under the absorption costing system they are distributed according to an...











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