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PERFECT COMPETITION, LONG-RUN PRODUCTION ANALYSIS: In the long run, a perfectly competitive firm adjusts plant size, or the quantity of capital, to maximize long-run profit. In addition, the entry and exit of firms into and out of a perfectly competitive market guarantees that each perfectly competitive firm earns nothing more or less than a normal profit. As a perfectly competitive industry reacts to changes in demand, it traces out positive, negative, or horizontal long-run supply curve due to increasing, decreasing, or constant cost.
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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 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
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"Believe one who has tried it. " -- Virgil, Roman poet
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CBOE
Chicago Board Options Exchange
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