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December 12, 2025 

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PART-TIME WORKERS: People who are willing and able to work full-time (over 35 hours per week), but are forced to work less because employers don't need their productive efforts. While part-time workers officially have jobs, and are officially included in the "employed" category when the official unemployment rate is calculated, their labor resources are really only partially unemployed. A person working 20 hours a week, who is willing and able to work 40 hours a week, really should be considered as "half employed."

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ENTRY BARRIERS: Institutional, government, technological, or economic restrictions on the entry of firms into a market or industry. The four primary barriers to entry are: resource ownership, patents and copyrights, government restrictions, and start-up costs. Barriers to entry are a key reason for market control and the inefficiency that this generates. In particular, monopoly, oligopoly, monopsony, and oligopsony often owe their market control to assorted barriers to entry. By way of contrast, perfect competition, monopolistic competition, and monopsonistic competition have few if any barriers to entry and thus little or no market control.

     See also | institution | government | technology | firm | market | market control | inefficiency | monopoly | monopsony | oligopsony | perfect competition | monopolistic competition | monopsonistic competition |


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WAGES, AGGREGATE SUPPLY DETERMINANT

One of several specific aggregate supply determinants assumed constant when the short-run aggregate supply curve is constructed, and that shifts the short-run aggregate supply curve when it changes. An increase in the wages causes a decrease (leftward shift) of the short-run aggregate supply curve. A decrease in the wages causes an increase (rightward shift) of the short-run aggregate supply curve. Other notable aggregate supply determinants include the technology, energy prices, and the capital stock. Wages are an example of a resource price aggregate supply determinant.

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Today, you are likely to spend a great deal of time at the confiscated property police auction looking to buy either a computer that can play video games and burn DVDs or a black duffle bag with velcro closures. Be on the lookout for slightly overweight pizza delivery guys.
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In the Middle Ages, pepper was used for bartering, and it was often more valuable and stable in value than gold.
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