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LERNER INDEX: The difference between price (p) and marginal cost (mc) as a fraction of price, that is [p-mc]/p. The Lerner index is usually taken as an indicator of market power because the larger the index, the larger the difference between price and marginal cost, that is, the larger the distance between the price and the competitive price. The Lerner index depends on the elasticity of demand. The Lerner index is also called the price-cost margin.

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CETERIS PARIBUS: A Latin term meaning that all other factors are held unchanged. The ceteris paribus assumption is used to isolate the effect one economic factor has on another. Without this assumption, it would be difficult to determine cause and effect in the economy. Relaxing the ceteris paribus assumption is the primary analytical technique used in the study of economics, especially when analyzing the market. Much like a chemist adds one chemical at a time to a mixture to determine the resulting reaction, an economist relaxes one ceteris paribus assumption at a time to observe the results.

     See also | assumption | cause and effect | economic analysis | comparative statics | determinants | market adjustment |


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AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE

A scientific society whose main mission is to advance science and innovation throughout the world. The American Association for the Advancement of Science (AAAS for short) publishes one of the most respected scientific magazines called Science. The association and magazine have nearly 140,000 individual and institutional subscribers, plus 272 affiliated organizations in more than 130 countries, serving a total of 10 million individuals. The American Association for the Advancement of Science was founded in 1848 to represent all disciplines of science and to support scientific exchange and discussion of science and society issues.

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During the American Revolution, the price of corn rose 10,000 percent, the price of wheat 14,000 percent, the price of flour 15,000 percent, and the price of beef 33,000 percent.
"Security can only be achieved through constant change, through discarding old ideas that have outlived their usefulness and adapting others to current facts. "

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