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June 25, 2018 

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SPECIAL INTEREST GROUP: A group that has more to gain or lose from some candidate, issue, or policy and thus tries extra hard to ensure that the political system is aware of their preferences. Some special interest groups can be fairly tame, merely voting in elections for their chosen candidate, while others are quite active. The more active ones form political action committees and undertake all forms of lobbying (legal and illegal). The ultimate success of special interest groups arises from the inclination of other people to choose rational ignorance and rational abstention.

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HHI: The common abbreviation for the Herfindahl-Hirshman index (or the Herfindahl index), which is a measure of concentration of the production in an industry that's calculated as the sum of the squares of market shares for each firm. This is an alternative method of summarizing the degree to which an industry is oligopolistic and the relative concentration of market power held by the largest firms in the industry. The Herfindahl index gives a better indication of the relative market control of the largest firms than can be found with the four-firm and eight-firm concentration ratios.

     See also | market share | oligopoly | concentration ratio | market control | antitrust laws |


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MARGINAL PROPENSITY TO SAVE

The proportion of each additional dollar of household income that is used for saving. The marginal propensity to save (abbreviated MPS) is another term for the slope of the saving line and is calculated as the change in saving divided by the change in income. The MPS plays a central role in Keynesian economics. It quantifies the saving-income relation, which is the flip side of the consumption-income relation, and thus it reflects the fundamental psychological law. It is also a critical to the multiplier process. A related saving measure is the average propensity to save.

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APLS

PINK FADFLY
[What's This?]

Today, you are likely to spend a great deal of time driving to a factory outlet trying 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 mail order catalogs with hidden messages.
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This isn't me! What am I?

The 1909 Lincoln penny was the first U.S. coin with the likeness of a U.S. President.
"It is not fair to ask of others what you are unwilling to do yourself. "

-- Eleanor Roosevelt, diplomat, activist

MSE
Mean Squared Error
A PEDestrian's Guide
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