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September 4, 2026 

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WELFARE ECONOMICS: A branch of economics that studies efficiency and the overall well-being of society based on alternative allocations of scarce resources. Welfare economics extends the microeconomic analysis of indifference curves to society as a whole. It is concerned with broad efficiency questions and criteria (Pareto efficiency and Kaldor-Hicks efficiency) as well as more specific efficiency issues (market failures, externalities, public goods).

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CHANGE IN AGGREGATE EXPENDITURES

The movement along an aggregate demand curve caused by a change in the price level. A change in aggregate expenditures is ONLY caused by a change in the price level. This is one of two changes related to aggregate demand. The other is a change in aggregate demand. A change in aggregate expenditures is comparable to a change in quantity demanded.

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Today, you are likely to spend a great deal of time driving to a factory outlet wanting to buy either a wall poster commemorating Thor Heyerdahl's Pacific crossing aboard the Kon-Tiki or decorative garden figurines. Be on the lookout for neighborhood pets, especially belligerent parrots.
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Helping spur the U.S. industrial revolution, Thomas Edison patented nearly 1300 inventions, 300 of which came out of his Menlo Park "invention factory" during a four-year period.
"Don't waste your effort on a thing that results in a petty triumph unless you are satisfied with a life of petty issues. "

-- John D. Rockefeller, industrialist

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