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January 14, 2026 

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PERFECT COMPETITION AND EFFICIENCY: Perfect competition is the idealized market structure that achieves an efficient allocation of resources. The conditions of perfect competition, including (1) large number of small firms, (2) identical products sold by all firms, (3) freedom of entry into and exit out of the industry, and (4) perfect knowledge of prices and technology, ensure that perfect competition efficiently allocates resources. This is in fact the purpose of perfect competition: a market structure that illustrates perfection, the best of all possible resource allocation worlds. The real world falls short of this perfection.

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CHANGE IN DEMAND: A shift of the demand curve caused by a change in one of the demand determinants. In essence, a change in demand is caused by any factor affecting demand EXCEPT price. This concept should be contrasted directly with a change in quantity demanded. You should also review the terms change in quantity supplied and change in supply, too. A change in demand is a change in ALL demand price-quantity demanded pairs, meaning that each price is matched up with a different quantity (which is illustrated as a shift of the demand curve). And this change in demand is caused by a change in any of the demand determinants. In contrast, a change in quantity demanded is a change from one price-quantity pair to the another (which is illustrated as a movement along a given demand curve).

     See also | demand | demand curve | demand determinants | price | demand price | quantity demanded | change in quantity demanded | change in quantity supplied | change in supply |


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REDUNDANT INFORMATION

Information received by the five senses (sight, sound, taste, touch, and smell) that is old, familiar, and usual. Because redundant information is not presumed to be threatening it can be largely ignored by the automatic response that is commonly termed the "fight or flight" reaction. The alternative is novel information, which is unfamiliar and potentially threatening.

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Today, you are likely to spend a great deal of time at a garage sale looking to buy either a large, stuffed giraffe or a birthday greeting card for your aunt. Be on the lookout for malfunctioning pocket calculators.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"You don't have to be a fantastic hero to do certain things - to compete. You can be just an ordinary chap, sufficiently motivated to reach challenging goals."

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