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May 25, 2026 

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AGGREGATE EXPENDITURE DETERMINANT: A ceteris paribus factor that affects aggregate expenditures, but which is 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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PURPLE SMARPHIN
Your compete MICRO*scope for today

You are the type of person who shops when you have to and buys what you need, but usually has more important things to do. Family and friends generally call the local library when they can't find you, and rightfully so. Today, you are likely to spend a great deal of time at the confiscated property police auction looking to buy either storage boxes for your summer clothes or 500 feet of coaxial cable. Be on the lookout for poorly written technical manuals. You should consider shopping at stores or businesses beginning with the letter R, but do not buy any products with a serial number or product code containing the number 156236. Your preferred shopping venue is the Internet. Your special symbol is the exclamation point (!).


Is this You?

As a Purple Smarphin, you are the brightest and most intelligent person you know. And that goes for shopping, too. You know exactly what you want. You know exactly what it costs. You know exactly when and where to buy. But, of course, shopping is only one of the many activities that attracts your intellectual attention. You shop when you need to and buy if have to, but shopping is not the end all of your life.


This isn't me! What am I?
COLLUSION, EFFICIENCY

Colluding oligopolistic firms generally produce less output and charge a higher price than would be the case for a perfectly competitive industry. The efficiency of colluding oligopolistic firms is essentially the same as that for monopoly. In essence, colluding oligopolistic firms function just as if the market is a monopoly. The price charged by the colluding firms is higher than the marginal cost of production and the quantity is less. Most notably, price is greater than marginal, a violation of the key condition for efficiency.

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Fact 7: Our Circular World

Our little excursion through the economy has had, thus far, its ups and downs. My cable bill remains permanently confused and my checking account has a large property-tax created imbalance, but at least the pain in my tooth stops before hitting my toes. I think we deserve a little rest and relaxation at the Shady Valley's own tourist mecca, Happy-Time Gala-World Fun-Land Extravaganza Amusement Park. Let's take a brief respite from our pedestrian trek and give the soles of our jogging shoes a well-deserved rest.

The Happy-Time Gala-World Fun-Land Extravaganza Amusement Park has the world famous Monster Loop Death Plunge roller coaster, guaranteed to make riders yearn for the pleasures of a Siberian forced labor camp. There's also the Enchanted Haunted Horror House filled with serial killers, chainsaw murders, and IRS auditors. For the more timid, and fortunately, for those more interested in the workings of our economy, the merry-go-round is the ride of choice.

Two familiar faces are enjoying the circular trip on their fiberglass ponies. The slender guy with the bushy mustache is Dan Dreiling, the drywall man. I had him repair a hole in my living room wall caused by an over-excited vacuum cleaner a few months back. The disgusted look on his dusty face tells me that I must have overlooked his $100 bill. The other recognizable rider is Pollyanna Pumpernickel a precocious pet store owner who has somehow neglected to pay me the $100 due for hamster-sitting services which I rendered a few weeks ago. Her furtive glances suggest that she is well aware of her liability.
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APLS

During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"There's a very positive relationship between people's ability to accomplish any task and the time they're willing to spend on it."

-- Dr. Joyce Brothers

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