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June 9, 2026 

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BANK OF THE UNITED STATES: This was actually two central banks that preceded the Federal Reserve System as the nation's monetary authority. The First Bank of the United States, under the design of Alexander Hamilton, commenced operations in 1791, almost immediately after the U.S. Constitution was written and George Washington became the first U.S. President. Its charter was not renewed and it ceased to operate in 1811. Financial instability resulting from the absence of a central bank over the next few years prompted the formation of the Second Bank of the United States in 1816. The Second Bank's performance, however, was somewhat more suspect. When it knocked heads with President Andrew Jackson, a strong critic of central banking, the Second Bank ceased to be in 1836.

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BARRIER TO ENTRY: 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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AGGREGATE DEMAND

The total real expenditures on final goods and services produced in the domestic economy that buyers are willing and able to undertake at different price levels, during a given time period (usually a year). Aggregate demand, usually abbreviated AD, is an inverse relation between price level and aggregate expenditures. This is one half of the AS-AD (aggregate market) analysis. The other half is aggregate supply. Aggregate demand consists of four aggregate expenditures--consumption expenditures, investment expenditures, government purchases, and net exports--made by the four macroeconomic sectors--household, business, government, and foreign.

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