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February 19, 2026 

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REALISM OF MONOPOLY: If taken to the extreme, monopoly, like perfect competition is an ideal market structure that does not actually exist in the real world. In the extreme, a "pure" monopoly is a market containing one and only ONE seller of good, a good with absolutely, positively no substitutes. The product is absolutely, certifiably unique. It's not just that it has no CLOSE substitutes, it has NO substitutes. Period. End of story. In the real world, however, every product, no matter how seemingly unique it might appear, has substitutes. The substitutes might not be very close. They might be really, really bad substitutes. But they are substitutes. As such, there are no pure monopolies in the real world.

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SLOPE, AGGREGATE EXPENDITURES LINE

The positive slope of the aggregate expenditures line is the sum of the marginal propensity to consume (MPC), marginal propensity to invest (MPI), and marginal propensity for government purchases (MPG), less the marginal propensity to import (MPM). This slope is greater than zero but less than one, reflecting induced expenditures by the four macroeconomic sectors (household, business, government, and foreign). The slope of the aggregate expenditures line determines the magnitude of the multiplier process.

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PURPLE SMARPHIN
[What's This?]

Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club wanting to buy either blue cotton balls or a genuine down-filled pillow. Be on the lookout for slightly overweight pizza delivery guys.
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This isn't me! What am I?

A thousand years before metal coins were developed, clay tablet "checks" were used as money by the Babylonians.
"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

-- Albert Einstein

DVP
Discounted Present Value
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