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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 are costs that change in proportion to the good or service that a business produces. Variable costs are also the sum of marginal costs over all units produced. They can also be considered normal costs.Fixed costs and variable costs make up the two components of total cost.Direct costs, however, are costs that can easily be associated with a particular cost object. However, not all variable costs are direct costs.ariable costs are costs that change in proportion to the good or service that a business produces. Variable costs are also the sum of marginal costs over all units produced. They can also be considered normal costs.