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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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DIAMOND-WATER PARADOX

The apparently conflicting and perplexing observation that water, which is more useful than diamonds, has a lower price than diamonds. This paradox was proposed by economists in the 1800s as a means understanding the role utility plays in the demand price of a good by differentiating between total utility and marginal utility.

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Today, you are likely to spend a great deal of time at an auction wanting to buy either a handcrafted bird feeder or a New York Yankees baseball cap. Be on the lookout for high interest rates.
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