Economic Definition of average fixed cost. Defined.
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Term average fixed cost Definition: Fixed cost per unit of output, found by dividing total fixed cost by the quantity of output. Average fixed cost is one of three related cost averages. The other two are average variable cost and average total cost. Average fixed cost, usually abbreviated AFC, decreases with larger quantities of output. The logic behind this relationship is relatively simply. Because fixed cost is FIXED and does not change with the quantity of output, a given cost is spread more thinly per unit as quantity increases. A thousand dollars of fixed cost averages out to $10 per unit if only 100 units are produced. But if 10,000 units are produced, then the average shrinks to a mere 10 cents per unit.