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GAME THEORY: An analysis that illustrates how choices between two plays affect the outcome of a "game." Game theory is commonly used in economics to illustrate interdependent decision-making among oligopoly firms. It illustrates that one firm makes a decision based on the decision expected from the other firm. One key conclusion from the game theory analysis is that firms often make decisions that are "second best" or the "lesser of two evils." The classic example of such a decision is the prisoners' dilemma, in which two prisoners both confess to a crime to avoid harsher punishment when not confessing would avoid any punishment.

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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 waiting for visits from door-to-door solicitors trying to buy either a large flower pot shaped like a Greek urn or a small palm tree that will fit on your coffee table. Be on the lookout for fairy dust that tastes like salt.
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Two and a half gallons of oil are needed to produce one automobile tire.
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