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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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PRINCIPAL-AGENT PROBLEM

A disconnection or conflict between the objectives and goals of the principal and those of the agent authorized to represent the principal. The principal-agent problem arises because an agent is given the responsibility and authority to take actions that affect both the principal, but can also affect the agent. This problem is common in corporate management, where the principal is shareholders and the agent is managers. It is also common in government, where the principal is the public and the agent is elected leaders.

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Today, you are likely to spend a great deal of time looking for a downtown retail store hoping to buy either a tall storage cabinet with five shelves and a secure lock or a birthday greeting card for your grandmother. Be on the lookout for poorly written technical manuals.
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The average bank teller loses about $250 every year.
"Act well at the moment, and you have performed a good action for all eternity."

-- Johann Kaspar Lavater

CRRA
Constant Relative Risk Aversion
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