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September 10, 2026 

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MARGINAL REVENUE CURVE, PERFECT COMPETITION: A curve that graphically represents the relation between the marginal revenue received by a perfectly competitive firm for selling its output and the quantity of output sold. Because a perfectly competitive firm is a price taker and faces a horizontal demand curve, its marginal revenue curve is also horizontal and coincides with its average revenue (and demand) curve. A perfectly competitive firm maximizes profit by producing the quantity of output found at the intersection of the marginal revenue curve and marginal cost curve.

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TANSTAAFL: A rather cumbersome and usually hard to remember acronym for the expression "There ain't no such thing as a free lunch. This is a favorite saving of many economists because it highlights, albeit in a grammatically questionable manner, the fundamental problem of scarcity. The phrase serves to emphasize that seemingly "free" lunches are not really free. While they might be free to the customer, someone must pay, that is, incur an opportunity cost of foregone production. The lunch eaten by one person cannot be eaten by another.

     See also | free lunch | scarcity | opportunity cost | scarce resource | scarce good |


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ECONOMIC THINKING

A way of looking at and analyzing the way the world works by comparing the cost of an action with the benefit generated. The study of economics is the process of economic thinking about issues related to the scarcity problem.

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Today, you are likely to spend a great deal of time at the confiscated property police auction trying to buy either a coffee cup commemorating yesterday or a replacement remote control for your television. Be on the lookout for celebrities who speak directly to you through your television.
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A communal society, a prime component of Karl Marx's communist philosophy, was advocated by the Greek philosophy Plato.
"Do not wait; the time will never be just right "

-- Napoleon Hill, author

DVP
Discounted Present Value
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