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December 4, 2025 

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LONG RUN, MICROECONOMICS: In terms of the microeconomic analysis of production and supply, a period of time in which all inputs in the production process are variable. The long run is primarily used to analyze production decisions for a firm and is also referred to as the planning horizon. The long run is a period of time in which a business can change the quantities of ALL resource inputs--labor, capital, land, and entrepreneurship. Nothing is fixed. If your factory is to small, well then, build a bigger one. The long-run analysis of production is used to better understand economies of scale, diseconomies of scale, and long-run market supply.

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MARGINAL REVENUE, MONOPOLISTIC COMPETITION

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopolistically competitive firm receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopolistically competitive firm equates marginal revenue and marginal cost.

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-- Stendhal, writer

Shopping Around For RETAIL PRICES

It's time for another one of our frequent stops at Mr. Market Super Food Discount Store, this time to check out the story behind retail prices. As consumers, we spend a large fraction of our nonworking, nonsleeping lives wandering grocery stores aisles, searching clothing store racks, and surveying department store displays for the right product at the right price. How do we know, like the name of the long-running game show, if "The Price is Right?" How are retail prices set and do they really tell us the value of a product?
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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers hoping to buy either a looseleaf notebook binder or hand lotion, a big bottle of hand lotion. Be on the lookout for pencil sharpeners with an attitude.
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A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
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