The change in imports purchased from the foreign induced by a change in income or production (national income or gross domestic product). The marginal propensity to import (abbreviated MPM) is another term for the slope of the imports line and is calculated as the change in imports divided by the change in income or production. The MPM 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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One of Shady Valley's featured factories is Mona Mallard's Duct Tape Industries. It's the world's leading producer of duct tape -- that shiny, seemingly omnipresent, cloth-like tape that's used for everything EXCEPT ventilation ducts. Mona Mallard's Duct Tape Industries also employs thousands of voting, taxpaying Shady Valley residents. The amount of campaign money, legal and otherwise, contributed by Mona Mallard herself to Shady Valley politicians is, well, incalculable. All of this means that our little pedestrian exploration through the backlot dumping ground of Mona Mallard's Duct Tape Industries main production plant puts us on very, VERY sensitive turf. The reason, of course, is that the duct tape plant has been discarding sticky, toxic, gooey junk onto the ground. This is a potentially hazardous situation, not only because this sticky, toxic, gooey junk appears to be leaking into the Shady Valley River, but because a Mona Mallard's Duct Tape Industries security guard is headed in our direction. Rather than confront this guard, I suggest we spend our time exploring the problems of pollution. RUN!
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Today, you are likely to spend a great deal of time at an auction looking 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 slow moving vehicles with darkened windows.
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