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October 27, 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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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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ORANGE REBELOON
[What's This?]

Today, you are likely to spend a great deal of time at a flea market hoping to buy either 500 feet of telephone cable or a package of 4 by 6 index cards, the ones with lines. Be on the lookout for telephone calls from long-lost relatives.
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This isn't me! What am I?

Al Capone's business card said he was a used furniture dealer.
"The way to gain a good reputation is to endeavor to be what you desire to appear. "

-- Socrates, philosopher

DRR
Discounted Rate of Return
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