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DPI: The abbreviation for disposable personal income, which is the total income that can be used by the household sector for either consumption or saving during a given period of time, usually one year. This is the income left over after income taxes and social security taxes are removed and government transfer payments, like welfare, social security benefits, or unemployment compensation are added. Because consumption and saving are important to our economy for short-run stability and long-run growth, pointy-headed economists like to keep a close eye on disposable personal income. Disposable personal income is reported quarterly (every three months) in the National Income and Product Accounts maintained by the Bureau of Economic Analysis.

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Lesson 2: Economic Science | Unit 2: Theory Page: 6 of 20

Topic: Abstraction <=PAGE BACK | PAGE NEXT=>

Economic theories are abstractions of the real world.

Three ways to abstract:
  • Words. The earliest human method of abstraction was to represent objects with words. Words also represent ideas. But words can have different meanings.
  • Graphs. Pictures, especially graphical pictures. Many economic theories are abstractly represented with graphs. A picture or graph can be less confusing that words.
  • Equations. Graphs are two-dimensional pictures of mathematical equations. Economic theories are often abstractly represented by equations. Equations can represent relationships between three or more things, like that for X, Y and Z:
Y = 3 + 2X - 4Z

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UTILITARIANISM

A philosophical view that the value or worth of an action depends on the amount of pleasure it generates or the amount of pain it prevents, or in economic terms, the amount of utility generated. Utilitarianism, although dating back to the early Greek philosophers, is largely attributable to the work of Jeremy Bentham and John Stuart Mill. This philosophy played a major role in the development of modern consumer demand theory and utility analysis.

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Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for gnomes hiding in cypress trees.
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The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.
"Nothing great has ever been achieved except by those who dared believe that something inside them was superior to circumstances. "

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