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February 8, 2026 

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AD-AS MODEL: An economic model relating the price level and real production that is used to analyze business cycles, gross domestic product, unemployment, inflation, stabilization policies, and related macroeconomic phenomena. The AS-AD model, inspired by the standard market model, captures the interaction between aggregate demand (the buyers) and short-run and long-run aggregate supply (the sellers).

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PIGOUVIAN TAX: A tax on an external cost, such as pollution, designed to use market forces to achieve an efficient allocation of resources. A. C. Pigou, one of the first economists to study the market failure of externalities, is credited with developing this tax system for internalizing costs external to the market. An external cost caused by pollution, for example, can be internalized if polluters pay a tax equal to the value of the external cost.

     See also | tax | externality | pollution | market failure | efficiency | market | demand curve | supply curve | materials balance | recycling | regulation | Coase theorem | command and control | pollution rights market |


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INJECTIONS

Non-consumption expenditures on aggregate production. The three aggregate expenditures grouped under the heading of injections are investment expenditures, government purchases and exports. Injections add to the core circular flow containing consumption, production, and income. The injections-leakages model is a Keynesian economics analysis that combines injections with leakages (saving, taxes, and imports) to identify the equilibrium level of aggregate production and income.

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Today, you are likely to spend a great deal of time wandering around the downtown area trying to buy either a replacement remote control for your television or a replacement nozzle for your shower. Be on the lookout for telephone calls from former employers.
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In his older years, Andrew Carnegie seldom carried money because he was offended by its sight and touch.
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