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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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MARGINAL UTILITY-PRICE RATIO

The ratio of the marginal utility obtained from consuming a good to the price of the good. This ratio is particularly important in determining consumer equilibrium, which is reached when the marginal utility-price ratios are the same for all goods. Equality between all marginal utility-price ratios is the rule of consumer equilibrium which is satisfied with utility maximization.

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Today, you are likely to spend a great deal of time at a garage sale hoping to buy either an AC adapter for your CD player or storage boxes for your family photos. Be on the lookout for the last item on a shelf.
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In the early 1900s around 300 automobile companies operated in the United States.
"Don't judge each day by the harvest you reap, but by the seeds you plant."

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Exponential Generalized Autoregressive Conditional Heteroskedasticity
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