Inventories include raw materials, auxiliary material and supplies, semi-finished products, finished products, work-in-progress and trading goods. Inventories are stated at the lower of cost or net realisable value. The acquisition or production costs are determined based on the weighted average acquisition costs. The production costs of semi-finished and finished products comprise the directly attributable production costs, including materials and manufacturing costs, as well as overhead costs. The net realisable value is the estimated selling price in the ordinary course of business less the production and distribution costs. To this end, coverage analyses are consulted for the products, while the date of acquisition is consulted for the book trade. Discounts are treated as reductions in the acquisition cost.