Absorption full costing is the accounting method that considers all manufacturing costs as product costs. These costs include variable and fixed manufacturing costs whether direct or indirect Variable direct) costing considers only variable manufacturing costs to be product costs. i.e.. inventoriable. Fixed manufacturing costs are considered period costs and are expensed as incurred. If production is increased without increasing sales, inventories will rise. However, all fixed costs associated with production will be an expense of the period under variable costing. Thus, this action will not artificially increase profits and improve the manager's review.