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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions 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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TWO-SECTOR, TWO-MARKET CIRCULAR FLOW

A simple circular flow model of the macroeconomy containing two sectors (business and household) and two markets (product and factor) that illustrates the continuous movement of the payments for goods and services between producers and consumers. The payment flow between the two sectors and two markets is conveniently divided into four segments representing consumption expenditures, gross domestic product, factor payments, and national income. More advanced models containing additional flow segments are two-sector, three-market circular flow; three-sector, three-market circular flow; and four-sector, three-market circular flow.

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APLS

RED AGGRESSERINE
[What's This?]

Today, you are likely to spend a great deal of time lost in your local discount super center hoping to buy either a lazy Susan for you dining room table or a set of serrated steak knives, with durable plastic handles. Be on the lookout for poorly written technical manuals.
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This isn't me! What am I?

A U.S. dime has 118 groves around its edge, one fewer than a U.S. quarter.
"We may affirm absolutely that nothing great in the world has been accomplished without passion."

-- Hegel

PPF
Production Possibilities Frontier
A PEDestrian's Guide
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