MATERIALS BALANCE: A hard and fast rule that the total amount of stuff removed from the natural environment will be eventually returned, probably as pollution. This is based on a fundamental law of physics that says material can be neither created nor destroyed, but only transformed. During any given period (such as a year) the quantity of materials returned to the environment is the difference between the quantity extracted and the quantity used by the economy.

     See also | environment | pollution | natural resources | pollution types | scarcity rent | Pigouvian tax | recycling | Coase theorem | command and control | pollution rights market |

MATERIALS BALANCE, AmosWEB GLOSS*arama, http://www.AmosWEB.com, AmosWEB LLC, 2000-2025. [Accessed: July 18, 2025].

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A graphical representation of the relation between aggregate expenditures on real production and the price level, holding all ceteris paribus aggregate demand determinants constant. The aggregate demand (AD) curve is one side of the graphical presentation of the aggregate market. The other side is occupied by the long-run aggregate supply curve and/or the short-run aggregate supply curve. The negative slope of the aggregate demand curve captures the inverse relation between aggregate expenditures on real production and the price level. This negative slope is attributable to the interest-rate, real-balance, and net-export effects.

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