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TOTAL FACTOR COST CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between total factor cost incurred by a perfectly competitive firm when using a given factor of production to produce a good or service. The total factor cost curve is most important in factor market analysis for the derivation of the marginal factor cost curve.

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TAX PROPORTIONALITY

The proportion of income paid in taxes at different levels of income. In some cases the proportion of income paid in taxes increases with income in other cases it decreases. And in still other cases, it remains the same. Tax proportionality comes in three alternatives -- proportional tax (different incomes pay the same proportion in tax), progressive tax (higher incomes pay a higher proportion in tax), and regressive (lower incomes pay a higher proportion in tax).

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The penny is the only coin minted by the U.S. government in which the "face" on the head looks to the right. All others face left.
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