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ADVERSE SELECTION: When a negotiation between two people with different amounts of information, that is, asymmetric information, restricts the quality of the good traded. This typically happens because the person with more information is able to negotiate a favorable exchange. This is frequently referred to as the "market for lemons."

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ABSTRACTION: Simplifying the complexities of the real world by ignoring (hopefully) unimportant details while doing economic analysis. Abstraction is often criticized because it's, well, it's JUST NOT REALISTIC. However, when done correctly (ignoring things that JUST DON'T MATTER), then the pursuit of knowledge is greatly enhanced by abstraction. For example, when travelling cross country along a high-speed interstate highway, a paper road map is a handy tool. It shows towns and cities along the way, the major intersections, rest stop locations, and other important points of interest. However, it ignores unimportant details. It doesn't realistically show the location of every tree, bush, or blade of grass. Why bother? This information won't enhance your road trip.

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DISEQUILIBRIUM, AGGREGATE MARKET

The state of the aggregate market in which real aggregate expenditures are NOT equal to real production, which results in an imbalance that induces a change in the price level, aggregate expenditures, and/or real production. In other words, the opposing forces of aggregate demand (the buyers) and aggregate supply (the sellers) are out of balance. At the existing price level, either the four macroeconomic sectors (household, business, government, and foreign) are unable to purchase all of the real production that they seek or producers are unable to sell all of the real production that they have.

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