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May 18, 2026 

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LRTC: The abbreviation for long-run total cost, which is the opportunity cost incurred by all of the factors of production used in the long run (when all inputs are variable) by a firm to produce of a good or service, including wages paid to labor, rent paid for the land, interest paid to capital owners, and a normal profit paid to entrepreneurs. Unlike short-run total cost, long-run total cost can not be separated into fixed cost and variable cost. In the long run, all inputs are variable, so all cost is variable.

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DECREASING-COST INDUSTRY

A perfectly competitive industry with a negatively-sloped long-run industry supply curve that results because expansion of the industry causes lower production cost and resource prices. A decreasing-cost industry occurs because the entry of new firms, prompted by an increase in demand, causes the long-run average cost curve of each firm to shift downward, which decreases the minimum efficient scale of production.

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Scraping Up The POLLUTION

One of Shady Valley's featured factories is Mona Mallard's Duct Tape Industries. It's the world's leading producer of duct tape -- that shiny, seemingly omnipresent, cloth-like tape that's used for everything EXCEPT ventilation ducts. Mona Mallard's Duct Tape Industries also employs thousands of voting, taxpaying Shady Valley residents. The amount of campaign money, legal and otherwise, contributed by Mona Mallard herself to Shady Valley politicians is, well, incalculable. All of this means that our little pedestrian exploration through the backlot dumping ground of Mona Mallard's Duct Tape Industries main production plant puts us on very, VERY sensitive turf. The reason, of course, is that the duct tape plant has been discarding sticky, toxic, gooey junk onto the ground. This is a potentially hazardous situation, not only because this sticky, toxic, gooey junk appears to be leaking into the Shady Valley River, but because a Mona Mallard's Duct Tape Industries security guard is headed in our direction. Rather than confront this guard, I suggest we spend our time exploring the problems of pollution. RUN!
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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 car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for defective microphones.
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The portrait on the quarter is a more accurate likeness of George Washington than that on the dollar bill.
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