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 ABSTRACTION METHODS: Abstraction is the process of simplifying the complexities of the real world by ignoring (hopefully) unimportant details, especially (for our purposes) while doing economic analysis. Three common methods of actual, real world abstraction used in economic theories are words, graphs, and equations. Words can be misunderstood. Graphs are a little more precise. And equations tend to be the most precise of the three.
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 Lesson 12: Elasticity and Demand | Unit 4: Determinants Page: 21 of 25

 Topic: Unit Review <=PAGE BACK | PAGE NEXT=>

In this unit, you should have learned about:
• Substitute availability as the key elasticity determinant that affects the value of the coefficient of elasticity.
• Why goods with more close substitutes tend to be more elastic and goods with fewer closer substitutes tend to be inelastic.
• Why elasticity is greater for longer time periods because buyers have more time to find available substitutes.
• Why elasticity is greater for goods that constitute a larger proportion of buyers' budgets and smaller for goods that make up a smaller proportion of buyers' budgets.

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MARGINAL REVENUE PRODUCT CURVE

A curve that graphically illustrates the relation between marginal revenue product and the quantity of the variable input, holding all other inputs fixed. This curve indicates the incremental change in total revenue for incremental changes in the variable input. The marginal revenue product curve plays a key role in marginal productivity theory and the economic analysis of factor markets.

 BLACK DISMALAPOD[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 blue mechanical pencil or super soft, super cuddly, stuffed animals. Be on the lookout for strangers with large satchels of used undergarments.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!
 "I do not believe in a fate that will fall on us no matter what we do. I do believe in a fate that will fall on us if we do nothing. "-- Ronald Reagan, 40th US president