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November 12, 2026 

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BARRIER TO ENTRY: An institutional, government, technological, or economic restriction on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

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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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APLS

GREEN LOGIGUIN
[What's This?]

Today, you are likely to spend a great deal of time at a dollar discount store trying to buy either pink cotton balls or a genuine down-filled comforter. Be on the lookout for the happiest person in the room.
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This isn't me! What am I?

Mark Twain said "I wonder how much it would take to buy soap buble if there was only one in the world."
"The art of leadership is saying no, not yes. It is very easy to say yes. "

-- Tony Blair, British prime minister

NDP
Net Domestic Product
A PEDestrian's Guide
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