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POLLUTION TYPES: Pollution residuals fall into one of three categories--degradable, nondegradeable, and persistent. Damage done by each type, and thus external cost, typically varies. At one extreme are degradable residuals and at the other are nondegradable. In the middle are persistent residuals.

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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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APLS

YELLOW CHIPPEROON
[What's This?]

Today, you are likely to spend a great deal of time at an auction hoping to buy either several magazines on time travel or 500 feet of telephone cable. Be on the lookout for malfunctioning pocket calculators.
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This isn't me! What am I?

Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"Success doesn't come to you . . . you go to it "

-- Marva Collins, Educator

LRAS
Long Run Aggregate Supply
A PEDestrian's Guide
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