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January 17, 2018 

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PIGOUVIAN TAX: A tax on an external cost, such as pollution, designed to use market forces to achieve an efficient allocation of resources. A. C. Pigou, one of the first economists to study the market failure of externalities, is credited with developing this tax system for internalizing costs external to the market. An external cost caused by pollution, for example, can be internalized if polluters pay a tax equal to the value of the external cost.

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INTERSECTION: In a graph the point at which two lines cross. In a more sophisticate mathematical view, the combination of two variables that simultaneously satisfy two separate relations. The most common intersection in economics involves the demand and supply curves. The equilibrium price and equilibrium quantity are the two variables that simultaneously satisfy the demand and supply relations (law of demand and law of supply). Most graphical intersection points are worth noting in the study of economics. More often than not an intersection point is also an equilibrium.

     See also | graph | curve | variable | market | demand | supply | equilibrium price | equilibrium quantity |


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MARGINAL PROPENSITY TO INVEST

The change in business investment expenditures induced by a change in income or production (national income or gross domestic product). The marginal propensity to invest (abbreviated MPI) is another term for the slope of the investment line and is calculated as the change in investment divided by the change in income or production. The MPI plays a role in Keynesian economics. It augments the slope of the aggregate expenditures line and is part to the multiplier process. A related marginal measure is the marginal propensity to consume.

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Today, you are likely to spend a great deal of time at a flea market looking to buy either a travel case for you toothbrush or a looseleaf notebook binder. Be on the lookout for empty parking spaces that appear to be near the entrance to a store.
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Two and a half gallons of oil are needed to produce one automobile tire.
"Being defeated is only a temporary condition; giving up is what makes it permanent."

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