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A discretionary fixed cost is an expenditure for a period-specific cost or a fixed asset, which can be eliminated or reduced without having an immediate impact on the reported profitability of a business.onsequently, though these costs are classified as discretionary, they should only be reduced when it is absolutely necessary to do so. The following can be considered discretionary fixed costs: 1  Advertising campaigns. 2  Employee training. 3  Investor relations. 4  Public relations.
Average fixed cost refers to fixed cost per unit of output. Average fixed Cost is found out by dividing the total fixed cost by the corresponding output. Formula: For instance, if the total fixed cost of a shoes factory is $5,000 and it produces 500 pairs of shoes, then the average fixed cost is equal to $10 per unit. If it produces 1,000 pairs of shoes, the average fixed cost is $5 and if the total output is 5,000 pairs of shoes, then the average fixed cost is $1 pair of shoe. From the above example, it is clear, that the fixed cost, i.e., $5,000 remains the same whether the output is 1,000 or 5,000 units.