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Direct material cost is the cost of the raw materials and components used to create a product. The materials must be easily identifiable with the resulting product (otherwise they are considered to be joint costs). The direct material cost is one of the few variable costs involved in the production process; as such, it is used in the derivation of throughput from production processes. Throughput is sales minus all totally variable expenses. Examples of direct materials are: 1  The timber used to construct a house. 2  The steel included in an automobile. 3  The circuit board included in a radio. 4  The fabric used to assemble clothing.
Variable Costs: Variable costs change in direct proportion to the level of production. This means that total variable cost increase when more units are produced and decreases when less units are produced.Although variable in total, these costs are constant per unit.ixed costs are those which do not change with the level of activity within the relevant range. These costs will incur even if no units are produced. For example rent expense, straight-line depreciation expense, etc. Fixed cost per unit decreases with increase in production.