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FIRST ESTATE: In past centuries, this included the religious leaders and clergy. In modern times, I like to use it in reference to politicians and government leaders who can exert a great deal of control over resources through the coercive powers of government. One historical function of the first estate is to protect the less powerful consumers, taxpayers, and workers of the third estate from the market control typically held by the business leaders of the second estate. It is not uncommon, however, for an unhealthy degree of cooperation between the first and second estates, which often ends up with the enslavement of the third estate (figuratively and literally). At times help is forthcoming from the watchdog journalist of the fourth estate--unless they too have been overtaken by the ruling elite.

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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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ADVERSE SELECTION

An inefficient, bad, or adverse outcome of a market exchange that results because buyers and/or sellers make decisions based on asymmetric information. This commonly results in a market that exchanges a lesser quality good, what is termed the market for lemons. Two related problems resulting from asymmetric information are moral hazard and the principal-agent problem. Two methods of lessoning the problem of adverse selection are signalling and screening.

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Today, you are likely to spend a great deal of time strolling around a discount warehouse buying club hoping to buy either a coffee cup commemorating last Friday (you know why) or a wall poster commemorating the first day of spring. Be on the lookout for high interest rates.
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In the early 1900s around 300 automobile companies operated in the United States.
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