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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Our pedestrian's jaunt through the economy is not, unfortunately, an unrestrained shopping spree for confectioneries, spark plug tools, and Houston, Texas. We have other important errands to run. At the moment we need to hike over to Shady Valley's exclusive provider of cable television services, the Merciless Monolithic Media Masters Cable Television Company, Inc., to inquire about a mysterious fee that appeared last month's bill.

The good news is that the Merciless Monolithic Media Masters (the 4M people) Cable office is a mere 2 miles (3 kilometers for the metrically inclined) from the Shady Valley Central Town Sprawling Hills Shopping Mall. A hop, skip, and a moderately long jump later, our excursion through the economy takes us to the front door of the 4M Cable Television Company where I hope to discover why last month's cable bill included a $3,569 charge for something called "The Vacation Channel." I didn't even know I had a vacation channel. (But, I'm sure it's a great channel, and if I don't have it, then I will certainly subscribe. Please don't disconnect me.)

Of course, because this an afternoon workday, the doors of the 4M office are locked. I can almost make out, through the expensive stained glass windows, what appears to be several Merciless Monolithic Media Masters Cable Television employees, with champaign bottles in hand, dancing on expensive mahogany desks. Let's not disturb them. As they say in the cable business, an upset worker is a disconnected customer.
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Today, you are likely to spend a great deal of time going from convenience store to convenience store seeking to buy either a set of steel-belted radial snow tires or a wall poster commemorating the 2000 Presidential election. Be on the lookout for small children selling products door-to-door.
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-- Barbara Bush, first lady

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