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MARGINAL COST CURVE: A curve that graphically represents the relation between marginal cost incurred by a firm in the short-run product of a good or service and the quantity of output produced. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables, like technology and resource prices, constant. The marginal cost curve is U-shaped. Marginal cost is relatively high at small quantities of output, then as production increases, declines, reaches a minimum value, then rises. This shape of the marginal cost curve is directly attributable to increasing, then decreasing marginal returns (and the law of diminishing marginal returns).

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BARTER

A method of trading goods, commodities, or services, directly for one another without the use of money. Barter was the first type of market exchanged undertaken by human civilization as people advanced beyond self sufficiency in the satisfaction of their wants and needs. Modern economies still use a modest amount of barter to allocate resources. The key to a barter exchange is a double coincidence of wants, in which each side of the exchange wants what the other side has and has want the other side wants. A barter exchange tends to be less efficient that exchanges involving money.

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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors hoping to buy either handcrafted decorations to hang on your walls or throw pillows for your bed. Be on the lookout for jovial bank tellers.
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In the late 1800s and early 1900s, almost 2 million children were employed as factory workers.
"When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, „I used everything you gave me.¾"

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