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POLLUTION: Any waste that imposes an opportunity cost when it's returned to the natural environment. Pollution is one of the more prevalent examples of an externality cost and market failure. Examples include, but by no means are limited to, car exhaust, municipal sewage, industrial waste, and agricultural chemical runoff from farms. Pollution waste can be classified as degradable, persistent, or nondegradable, depending on how easily it can be broken down into nonharmful form by the natural environment. Pollution problems can never be eliminated, but they can be handled with efficiency if the amount of pollution is such that the cost of damages is the same as the cost of cleanup.
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                           VARIABLES: Quantities, usually represented as symbols, that can take on one of a set of values. A variable is "variable" because its value can "vary." A primary goal of economic analysis is to determine the specific value that a variable takes on under specific circumstances. Variables are allowed to vary, to take on different values. Models combine variables in a systematic manner (based on the underlying theory). The basic purpose of a model is then to identify different, specific values for the variables.For example, the two key variables in a market model are price and quantity. Analysis of the market model then identifies specific values for price and quantity. Endogenous and ExogenousIn the analysis of a model, variables generally take one of two forms -- endogenous (or dependent) and exogenous (or independent).- Endogenous: The values of endogenous or dependent variables are identified within the workings of the model. For example, price and quantity are endogenous variables for the market model. Endogenous variables are, in essence, the "output" of the model. Their identification is what the model is all about.
- Exogenous: The values of exogenous or independent variables are established outside the workings of the model. For example, income or the cost of a productive resource are common exogenous variables for the market model. Exogenous variables are the "input" of the model. They are pre-determined or "given" to the model.
InteractionThe interaction among endogenous and exogenous variables is key to the analysis of a model. Endogenous variables in a model are identified based on the pre-determined values of exogenous variables. Should these exogenous variables take on different values, then the endogenous variables also generally take on different values.For example, endogenous price and quantity variables identified in a market model are, in part, based on the exogenous variable--the income of the buyers. Should buyers have more or less income, then their demand is likely to change and so too are price and quantity.
Recommended Citation:VARIABLES, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2024. [Accessed: May 20, 2024].
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PURPLE SMARPHIN
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Today, you are likely to spend a great deal of time waiting for visits from door-to-door solicitors looking to buy either a computer that can play music and burn CDs or a T-shirt commemorating last Friday (you know why). Be on the lookout for strangers with large satchels of used undergarments.
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The wealthy industrialist, Andrew Carnegie, was once removed from a London tram because he lacked the money needed for the fare.
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"Many people think that if they were only in some other place, or had some other job, they would be happy. Well, that is doubtful. So get as much happiness out of what you are doing as you can and don't put off being happy until some future date. " -- Dale Carnegie
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OFT
Office of Fair Trading (UK)
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