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MARGINAL PROPENSITY TO INVEST: The proportion of each additional dollar of national income that is used for investment expenditures. Or alternatively, this is the change in investment expenditures due to a change in national income. Abbreviated MPI, the marginal propensity to invest is the slope of the investment line used in the analysis of Keynesian economics. As such, it also plays a role in the slope of the aggregate expenditure line and the multiplier effect.

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PRODUCER SURPLUS

The revenue that producers obtain from a good over and above the price paid. This is the difference between the minimum supply price that sellers are willing to accept and the price that they actually receive. A related notion from the demand side of the market is consumer surplus.

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Today, you are likely to spend a great deal of time searching for rummage sales trying to buy either a desktop calendar with all federal and state holidays highlighted or a half-dozen helium filled balloons. Be on the lookout for jovial bank tellers.
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The first paper currency used in North America was pasteboard playing cards "temporarily" authorized as money by the colonial governor of French Canada, awaiting "real money" from France.
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