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July 18, 2025 

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KILLER APPLICATION: A computer program that is so incredibly useful, popular, and profitable that the company responsible for development achieves enormous growth in a relatively short time period. Several computer companies developed killer applications during the 1980s and 1990s, which contributed greatly to the computer revolution. The Lotus 1-2-3 spreadsheet program was among the first, and perhaps most noted, killer applications. This program motivated millions of businesses and consumers in the early 1980ds to purchase personal computers.

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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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AVERAGE-MARGINAL RELATION

A mathematical connection between a marginal value and the corresponding average value stating that the change in the average value depends on a comparison between the average and the marginal. This mathematical relation between average and marginal surfaces throughout the study of economics, especially production (average product and marginal product), cost (average total cost and marginal cost), and revenue (average revenue and marginal revenue). A similar relation is that between a total value and the corresponding marginal value.

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Today, you are likely to spend a great deal of time calling an endless list of 800 numbers wanting to buy either a weathervane with a cow on top or a box of multi-colored, plastic paper clips. Be on the lookout for high interest rates.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
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