A graphical depiction of the relation between government purchases by the government sector and the economy's aggregate level of income or production. This relation plays a key role in the study of Keynesian economics. A government purchases line is characterized by vertical intercept, which indicates autonomous government purchases, and slope, which is the marginal propensity for government purchases and indicates induced government purchases. The aggregate expenditures line used in Keynesian economics is derived by adding or stacking the government purchases line onto the consumption line, as well as investment expenditures and net exports.

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Across the interstate from the Mega-Mart Discount Warehouse Super Center resides the Shady Valley Central Town Sprawling Hills Shopping Mall -- a prime example of our economy's climate-controlled, suburban shopping phenomenon. Our pedestrian's ramble through the economy would be totally inadequate if we did not spend at least one day strolling past the endless rows of stores with their displays of clothes, shoes, electronics, clothes, luggage, clothes, cheese pretzels, and of course clothes. Our pedestrian trip, however, is not concerned with the products exhibited beyond the stylish glass windows. No, our jumping off point is the gadzillions of people who pass us by, bump into us, get in our way, and generally make our shopping experience comparable to a commuter train during the rush hour.

Those who comprise the shopping crowd are short, tall, young, old, fat, thin, black, white, happy, and sad. More importantly for our present discussion, however, is that some are rich and some are not-so-rich. A few of the wealthier shoppers actually buy the products framed by the picturesque windows that line the air-conditioned quaint mid-way of Shady Valley Central Town Sprawling Hills Shopping Mall. Others must be content to ogle the prominently displayed products or perhaps buy an occasional cheese pretzel.
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Today, you are likely to spend a great deal of time browsing through a long list of dot com websites hoping to buy either storage boxes for your winter clothes or several magazines on time travel. Be on the lookout for mail order catalogs with hidden messages.
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