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INCOME, DEMAND DETERMINANT: One of the five demand determinants assumed constant when a demand curve is constructed, and that shift the demand curve when they change. Income affects demand differently for normal goods and inferior goods. A normal good, the name indicates, is affected by income much as you might expect. Additional income allows buyers to purchase more normal goods, thus demand increases with an increase in income. The demand for an inferior good is affected exactly opposite. An increase in income causes a decrease in the demand for an inferior good. Buyers decide to buy less of an inferior good when they have additional income.

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Lesson 2: Economic Science | Unit 1: The Method Page: 3 of 20

Topic: A Process <=PAGE BACK | PAGE NEXT=>

The scientific method follows a process to systematically examine and explain our world.

The process:

  • First, generally accepted principles form a theory.
  • Second, the theory inspires hypotheses.
  • Third, hypotheses are tested with real world data.
  • Fourth, if supported, the hypotheses become principles.
  • Fifth, new principles are added to the theory.
  • Last, new, the improved theory inspires more hypotheses.

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CONCENTRATION RATIOS

A family of measures of the proportion of total output in an industry that is produced by a given number of the largest firms in the industry. The two most common concentration ratios are for the four largest firms and the eight largest firms. The four-firm concentration ratio is the proportion of total output produced by the four largest firms in the industry and the eight-firm concentration ratio is proportion of total output produced by the eight largest firms in the industry. Concentration ratios are commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control of the largest firms in the industry. A related measure is the Herfindahl index.

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Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either a replacement battery for your pocket calculator or a how-to book on home remodeling. Be on the lookout for strangers with large satchels of used undergarments.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
"When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, I used everything you gave me."

-- Erma Bombeck, writer

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