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 VERIFIED PRINCIPLE: A generally accepted, verified, fundamental law of nature that has been tested against and verified with real world data. A verified principle begins as an hypotheses implied by a theory, which is then compared against real world observations. If the hypothesis is consistently supported by data, it achieves the rank "verified" principle. This should be contrasted with unverifiable axiom.
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 Lesson Contents Unit 1: An Overview Elasticity And Demand Price Elasticity Of Demand Upon Further Review Unit 1 Summary Unit 2: The Continuum Relative Adjustments Five Alternatives Three Of Five Two Of Five Unit 2 Summary Unit 3: Measurement Doing The Numbers A Range Of Values The Demand Curve Slope And Elasticity Changing Elasticity Total Revenue Expenditures And Elasticity Unit 3 Summary Unit 4: Determinants Substitute Availability Time Period Budget Proportion Unit 4 Summary Unit 5: Other Measures Price Elasticity Of Supply Income Elasticity Of Demand Cross Elasticity Of Demand Unit 5 Summary Course Home
Elasticity and Demand

Elasticity is the relative responsiveness of one variable to changes in another variable. Economists find this notion of elasticity quite useful in the study of markets. In this lesson, we examine the basics of demand elasticity, especially the price elasticity of demand.

• The first unit of this lesson, An Overview, gets us started with a review of several concepts related to elasticity and demand.
• In the second unit, The Continuum, we take a close look at how the five elasticity alternatives are reflected by demand curves.
• The third unit, Measurement, runs through some numbers for measuring the price elasticity of demand, and how elasticity values related to a straightline demand curve.
• The fourth unit, Determinants, examines how the three determinants of elasticity affect the elasticity coefficient.
• The fifth unit and final unit, Other, closes this lesson by introducing examine three related elasticity measures.

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EFFICIENT INFORMATION SEARCH

A comparison between the cost of acquiring information and the benefit generated by the information such that it is not possible to increase welfare or well being by acquiring any more of any less information. Efficient information search is achieved by equating the marginal cost of search with the benefit of search. This efficiency is comparable to the profit-maximizing decision by a producer and the utility-maximizing decision by a consumer.

 BROWN PRAGMATOX[What's This?] Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors trying to buy either a remote controlled sports car with an air spoiler or semi-gloss photo paper that works with your neighbor's printer. Be on the lookout for gnomes hiding in cypress trees.Your Complete Scope
 A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court!
 "My future starts when I wake up every morning . . . Every day I find something creative to do with my life. "-- Miles Davis, musician
 PITPersonal Income Tax
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