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MARGINAL ANALYSIS: A basic technique used in the economics that analyzes small, incremental changes in key variables. The economic obsession with marginal changes exists for at least two reasons. One reason is that many economic decisions made in the real world are made "at the margin." A second reason for using marginal analysis can best be termed analytical sophistication.

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FOUR-FIRM CONCENTRATION RATIO

The proportion of total output in an industry produced by the four largest firms in an industry. This is one of two common concentration ratios. The other is the eight-firm concentration ratio. Another related measure is the Herfindahl index. The four-firm concentration ratio is commonly used to indicate the degree to which an industry is oligopolistic and the extent of market control held by the four largest firms in the industry.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either a genuine down-filled comforter or a 200-foot blue garden hose. Be on the lookout for letters from the Internal Revenue Service.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"The majority of men meet with failure because of their lack of persistence in creating new plans to take the place of those that fail. "

-- Napoleon Hill, author

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