Expenditures on aggregate production by the four macroeconomic sectors that do not depend on income or production (especially national income or even gross domestic product). That is, changes in income do not generate changes in these expenditures. Each of the four aggregate expenditures--consumption, investment expenditures, government purchases, and net exports--have an autonomous component. Autonomous expenditures are affected by the ceteris paribus aggregate expenditures determinants and are measured by the intercept term of the aggregate expenditures line. The alternative to autonomous expenditures are induced expenditures, expenditures which do depend on income.

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Like most consumers, workers, and taxpayers, I engage in market exchanges for a lot of stuff -- food, labor, shelter, entertainment, confectionery products. But as I wandered through the peaceful community of Shady Valley, U. S. of A., I entered a "market" that I would have rather avoided. That's right, as the title indicates, I exchange some crime. I was mugged -- relieved of several valuable possessions -- right in front of the Shady Valley police station. I did the selling and my mugger did the "buying." While my part in the exchange was involuntary, the mugger's part was quite voluntary. In fact, the perpetrator of this crime acted much like any consumer headed to Natural Ned's Nursery and Garden Center in search of a creeping juniper. Let's see why?
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Today, you are likely to spend a great deal of time at a flea market wanting to buy either a velvet painting of Elvis Presley or a wall poster commemorating yesterday. Be on the lookout for bottles of barbeque sauce that act TOO innocent.
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This isn't me! What am I?

-- Richard Branson, Virgin Group founder

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