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BARTER EXCHANGE: A method of trading goods, commodities, or services, directly for one another without the use of money. In a barter exchange one good is traded directly for another. This sort of exchange ultimately requires a double coincidence of wants, meaning that each trader has what the other trader wants and wants what the other has. Without a double coincidence of wants the exchange process can become exceedingly complex, requiring a great deal of resources to complete transactions, resources that can not be used for production. In fact, inefficient barter trading was the primary reason that money was invented. With money, more resources can be used for production and fewer are needed for trading. See market.

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SCIENCE

A discipline, or topic of study, that uses the scientific method to investigate and explain the operation of the world by testing and verifying hypothesized relations. Science is commonly divided into physical sciences (including chemistry, physics, and biology) and social sciences (including economics, sociology, and political science). Science is not just a subject, but a method of investigation using the scientific method.

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Today, you are likely to spend a great deal of time at a flea market trying to buy either a coffee cup commemorating the first day of winter or a video game player. Be on the lookout for telephone calls from former employers.
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Lombard Street is London's equivalent of New York's Wall Street.
"What we have done for ourselves alone dies with us; what we have done for others and the world remains and is immortal."

-- Albert Pike

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Weak Law of Large Numbers
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