Economic Definition of fixed cost. Defined.
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Term fixed cost Definition: In general, cost that does not change with changes in the quantity of output produced. More specifically, fixed cost is combined with the adjectives "total" and "average" to indicate the overall level of fixed cost or the per unit fixed cost. Fixed cost is incurred whether of not any output is produced. The same fixed cost is incurred at any and all output levels. This means that total fixed cost is, in fact, FIXED. However, it also means that average fixed cost, or fixed cost per unit, declines as the output level increases. Spreading out $100 over 1,000 units gives a lower per unit fixed cost that spreading out $100 over 10 units.