The positive slope of the government purchases line is also termed the marginal propensity for government purchases (MPG). This slope is greater than zero but less than one, reflecting induced government purchases. The slope of the government purchases line affects the slope of the aggregate expenditures line and thus also affects the magnitude of the multiplier process.

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In the discussion of recession we see that one of the problems confronting both pedestrians and the economy is stepping in an occasional pothole. These potholes are usually small and do little damage. Every now and then, however, our economy falls face first into one humdinger of pothole that's big enough to swallow the better part of a marching band. Rather than a mere recessionary pothole, these are best thought of as depressionary canyons. The Great Depression of the 1930s was the most memorable depressionary canyon on record for the good old U. S. of A. The question we need to ponder over the next few pages is: Are there any more depressionary canyons like the 1930s lurking along the economic pavement?
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Today, you are likely to spend a great deal of time wandering around the shopping mall trying to buy either a T-shirt commemorating last Friday (you know why) or a rotisserie oven that can also toast bread. Be on the lookout for door-to-door salesmen.
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