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November 12, 2026 

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SPATIAL DIFFERENTIATION: The notion that economic activity is not evenly dispersed across the land. That is, goods, services, resources, production, and consumption are more concentrated at some locations and less concentrated at other locations due to natural endowments and human activity. The result is that no two location points have exactly the same access to inputs or outputs. This is a fundamental principle underlying the study of urban and regional economics and implies that firms and households must include transportation cost and location in production and consumption decisions.

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LONG-RUN AVERAGE COST CURVE, DERIVATION

The long-run average cost curve is the envelope of an infinite number of short-run average total cost curves, with each short-run average total cost curve tangent to, or just touching, the long-run average cost curve at a single point corresponding to a single output quantity. The key to the derivation of the long-run average cost curve is that each short-run average total cost curve is constructed based on a given amount of the fixed input, usually capital. As such, when the quantity of the fixed input changes, the short-run average total cost curve shifts to a new location.

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RED AGGRESSERINE
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Today, you are likely to spend a great deal of time wandering around the downtown area looking to buy either a birthday greeting card for your uncle or a T-shirt commemorating the 2000 Presidential election. Be on the lookout for fairy dust that tastes like salt.
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Sixty percent of big-firm executives said the cover letter is as important or more important than the resume itself when you're looking for a new job
"The art of leadership is saying no, not yes. It is very easy to say yes. "

-- Tony Blair, British prime minister

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Integrated Generalized Autoregressive Conditional Heteroskedasticity
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