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March 15, 2025 

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AGGREGATION: The process of adding up, summing, or otherwise identifying the total value of a variable or measure, especially when used in the study of macroeconomics. Common items that are aggregated are demand, supply, and expenditures on gross domestic product, which result in aggregate demand, aggregate supply, and aggregate expenditures.

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ENTRY BARRIER: An institutional, government, technological, or economic restriction 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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MARGINAL REVENUE, MONOPOLY

The change in total revenue resulting from a change in the quantity of output sold. Marginal revenue indicates how much extra revenue a monopoly receives for selling an extra unit of output. It is found by dividing the change in total revenue by the change in the quantity of output. Marginal revenue is the slope of the total revenue curve and is one of two revenue concepts derived from total revenue. The other is average revenue. To maximize profit, a monopoly equates marginal revenue and marginal cost.

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BLACK DISMALAPOD
[What's This?]

Today, you are likely to spend a great deal of time looking for a downtown retail store looking to buy either a black duffle bag with velcro closures or any book written by Isaac Asimov. Be on the lookout for strangers with large satchels of used undergarments.
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In the early 1900s around 300 automobile companies operated in the United States.
"I don't subscribe to the thesis, 'Let the buyer beware,' I prefer the disregarded one that goes, 'Let the seller be honest.'"

-- Isaac Asimov, Author

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Brookings Papers on Economic Activity
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