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TOTAL COST AND MARGINAL COST: A mathematical connection between marginal cost and total cost stating that marginal cost IS the slope of the total cost curve. If the total cost curve has a positive slope (that is, is upward sloping), then marginal cost is positive. Moreover, if the total cost curve has a positive and increasingly steeper slope, then the marginal cost is positive and rising. If the total cost curve has a positive and decreasingly steeper slope, then the marginal cost is positive but falling.

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CHANGE IN QUANTITY DEMANDED

A movement along a given demand curve caused by a change in demand price. The only factor that can cause a change in quantity demanded is price. A related, but distinct, concept is a change in demand.

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BLACK DISMALAPOD
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Today, you are likely to spend a great deal of time wandering around the shopping mall looking to buy either clothing for your pet iguana or a set of hubcaps. Be on the lookout for vindictive digital clocks with revenge on their minds.
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This isn't me! What am I?

Natural gas has no odor. The smell is added artificially so that leaks can be detected.
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