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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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LONG-RUN INDUSTRY SUPPLY CURVE

The relation between market price and the quantity supplied by all firms in a perfectly competitive industry after the industry has completed its long-run adjustment. The long-run industry supply curve effectively traces out a series of equilibrium prices and quantities that reflect long-run adjustments of a perfectly competitive industry to demand shocks. This long-run adjustment can take one of three paths, indicating an increasing-cost industry, a decreasing-cost industry, and a constant-cost industry.

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Today, you are likely to spend a great deal of time at a dollar discount store trying to buy either a birthday greeting card for your grandfather or a weathervane with a cow on top. Be on the lookout for the last item on a shelf.
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The earliest known use of paper currency was about 1270 in China during the rule of Kubla Khan.
"My philosophy of life is that if we make up our mind what we are going to make of our lives, then work hard toward that goal, we never lose - somehow we win out."

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