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Accounting Profit
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The difference between total revenues and explicit costs only.
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Average Fixed Cost
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A firm's total fixed cost divided by total output.
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Average Product
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Total Product divided by the variable input used in production.
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Diseconomies of Scale
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At the stage of output, as a firm's output increases, its long-run average total cost (LRATC) curve increases. The upward sloping part of the LRATC.
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Economic Profit
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Total revenues subtracted by both explicit and implicit costs; this is the type of profit referred to in Economics.
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Excise Tax
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A per-unit tax placed on the sales of a specific product.
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Fixed Costs
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These costs do not change when quantity changes in the short run, but can change in the long run.
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Law of Diminishing Marginal Returns
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The range of output over which smaller and smaller additional units of output are produced as successive equal increments of a variable input are added to fixed quantities of other inputs in the short run.
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Long Run
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Period of time over which supply can fully adjust to changes in demand
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Lump-Sum Tax
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A fixed tax on producers regardless of the amount produced; affects average fixed cost and average total cost.
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Marginal Cost
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What it costs to produce an additional unit of output; equal to ΔTC/ΔQ
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Marginal Product
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How much additional output is produced when an input is added by a firm.
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Normal Profit
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Zero economic profit, where an entrepreneur will not be better off in any other venture.
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Per-Unit Tax
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A tax on each additional unit produced, and affects variable costs: marginal cost, average total cost, and average variable cost.
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Short Run
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Period of time over which supply cannot fully adjust to changes in demand due to fixed resources.
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Total Costs
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The total of fixed and variable costs.
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Variable Costs
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These costs change as production increases.