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June 9, 2026 

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TOTAL REVENUE, PERFECT COMPETITION: The revenue received by a perfectly competitive firm for the sale of its output. Total revenue is one two bits of information a perfectly competitive firm needs to calculate economic profit, the other is total cost. In general, total revenue is the price times quantity--the price received for selling a good times the quantity of the good sold at that price. For a perfectly competitive firm, which receives a single unchanging price for all output sold, the calculation is relatively easy. Two other revenue measures directly related to total revenue are average revenue and marginal revenue. Total revenue is often depicted as a total revenue curve.

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INDEPENDENT VARIABLE: A variable that is identified outside the workings of the model. Also termed an exogenous variable, an independent variable is in essence the "input" of the model. It should be compared with an endogenous variable this is the "output" of the model.

     See also | variable | model | dependent variable | economic analysis | comparative statics | abstraction |


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POINT ELASTICITY

The relative responsiveness of a change in one variable (call it B) to an infinitesimally small change in another variable (call it A). The notion of point elasticity typically comes into play when discussing the elasticity at a specific point on a curve.

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Today, you are likely to spend a great deal of time browsing about a thrift store hoping to buy either car battery jumper cables or a dozen high trajectory optic orange golf balls. Be on the lookout for strangers with large satchels of used undergarments.
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The New York Stock Exchange was established by a group of investors in New York City in 1817 under a buttonwood tree at the end of a little road named Wall Street.
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