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January 20, 2026 

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AGGREGATE EXPENDITURE DETERMINANTS: An assortment of ceteris paribus factors that affect aggregate expenditures, but which are assumed constant when the aggregate expenditure line is constructed. Changes in any of the aggregate expenditures determinants cause the aggregate expenditure line to shift. While a wide variety of specific ceteris paribus factors can cause the aggregate expenditure line to shift, it's usually most convenient to group them into the four, broad expenditure categories -- consumption, investment, government purchases, and net exports. The reason is that changes in these expenditures are the direct cause of shifts in the aggregate expenditure line. If any determinant affects aggregate expenditures it MUST affect one of these four expenditures.

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BROWN PRAGMATOX
Your compete MICRO*scope for today

You are the type of person who leans toward the frugal end of the spending spectrum, the extremely frugal end. Family and friends occasionally strap large packages to your back for no apparent reason. Today, you are likely to spend a great deal of time searching for rummage sales hoping to buy either a flower arrangement with daisies and carnations for your uncle or a coffee cup commemorating next Thursday. Be on the lookout for jovial bank tellers. You should consider shopping at stores or businesses beginning with the letter L, but do not buy any products with a serial number or product code containing the number 397784. Your preferred shopping venue is thrift stores. Your special symbol is the comma (,).


Is this You?

As a Brown Pragmatox, you are down-to-earth and practical. You are hard working and industrious. You are frugal to the point that you might even refrain from making a purchase that you really, really need. Doing so often causes problems down the road. You definitely go with function over form and substance over style.


This isn't me! What am I?
MARGINAL REVENUE PRODUCT AND FACTOR DEMAND

A perfectly competitive firm's factor demand curve is that negatively-sloped portion of its marginal revenue product curve. A perfectly competitive firm maximizes profit by hiring the quantity of input that equates factor price and marginal revenue product. As such, the firm moves along its negatively-sloped marginal revenue product curve in response to changing factor prices.

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Paying TAXES

The time has come to take a firm stand! The Shady Valley Gazette Tribune-Journal has published an inflammatory editorial calling for a "pedestrian" tax on anyone who ambles around the economy. This tax, as every pedestrian would surely agree, is misguided and short-sighted. It's also unfair and probably unconstitutional. How DARE the editors of the Shady Valley Gazette Tribune-Journal call for a "pedestrian" tax. Sure they argue that ambling pedestrians should help pay for the sidewalks, traffic signals, and other assorted public goods. But, it's certainly not in MY best interest as a pedestrian to pay this misguided, short-sighted, unfair, and probably unconstitutional tax.
Tell me more...

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APLS

Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"Act well at the moment, and you have performed a good action for all eternity."

-- Johann Kaspar Lavater

SLLN
Strong Law of Large Numbers
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