If you talk to your local cost accountant, they will tell you that labor costs (along with materials and supplies) are recorded as variable costs. In reality, they should be treated as fixed costs. Why is that? Because, in the short run, it is not easy to turn this asset into costs that can vary with revenue which is the definition of a variable cost. It is very difficult to lay off people in a low revenue month and then rehire them in a high revenue month. If you try to do that, hiring costs, training costs and cost of quality all increase usually to the degree that they more than offset keeping the people through the downturn.
Many companies will try to furlough people or send them home early in an attempt to turn this fixed cost into a variable cost. While this works in the short run, people will get tired of the lower income and unpredictable work schedule and eventually will look for a new job. This again raises the cost of hiring, training, etc.
The only true variable labor cost is the use of temps and overtime. If your company is in a volatile market, it is best to plan for a level of temps and overtime to create a variable environment.
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