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SIXTH RULE OF IGNORANCE: The sixth of seven basic rules of the economy. It is a fact of life that obtaining information is a costly activity, it requires resources that have alternative uses. As such, no one knows everything and everyone is ignorant about something. I might know a lot about economics, but you can recite every line of every episode of "Gilligan's Island", and that weird-looking guy you bumped into at the store has a detailed account of everything you've done for the past five years.

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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 surfing the Internet looking to buy either a how-to book on home remodeling or a tall storage cabinet with five shelves and a secure lock. Be on the lookout for crowded shopping malls.
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Rosemary, long associated with remembrance, was worn as wreaths by students in ancient Greece during exams.
"If you don't make mistakes, you aren't really trying."

-- Coleman Hawkings,musician

WLLN
Weak Law of Large Numbers
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