What are the total fixed cost, total variable cost and total cost of a firm? How are they related?
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What are the total fixed cost, total variable cost and total cost of a firm? How are they related?
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Total Fixed Cost (TFC)

This refers to the costs sustained by a firm in order to acquire the fixed factors for production like cost of machinery, buildings, depreciation, etc. The cost which does not change with the change in output is called TFC. In the short run, fixed factors cannot vary and accordingly the fixed cost remains the same through all output levels. These are also called overhead costs. In other words, fixed costs are the total outlay of the purchase or hiring of fixed factors of production.

Total Variable Cost (TVC)

 This refers to the costs incurred by a firm on variable inputs for production. As we increase quantities of variable inputs, accordingly the sustained variable cost also goes up. It is also called 'Prime cost' or 'Direct cost' and includes expenses like - wages of labour, fuel expenses, etc.

 The cost which changes with the change in output is called TVC.

Total Cost (TC)

The sum of total fixed cost and total variable cost is called the total cost. Total cost = Total fixed cost + Total variable cost TC = TFC + TVC

Relationship between TC, TFC, and TVC

 1) TFC curve remains constant throughout all the levels of output as the fixed factor is constant in the short run.

 2) TVC rises as the output is increased by employing more and more labour units. Till point Z, TVC rises at a decreasing rate, and so the TC curve also follows the same pattern.

 3) The difference between TC and TVC is equivalent toTFC.

4) After point Z, TVC rises at an increasing rate and therefore TC also rises at an increasing rate.

 5) Both TVC and TFC is derived from TC i.e. TC = TVC +TFC 6) Eg: if TFC is 15, TVC is 5, and then TC will be 15+5=20.
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