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July 26, 2024 

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LONG-RUN AVERAGE COST CURVE: A curve depicting the per unit cost of producing a good or service in the long run when all inputs are variable. The long-run average cost curve (usually abbreviated LRAC) can be derived in two ways. On is to plot long-run average cost, which is, long-run total cost divided by the quantity of output produced. at different output levels. The more common method, however, is as an envelope of an infinite number of short-run average total cost curves. Such an envelope is base on identifying the point on each short-run average total cost curve that provides the lowest possible average cost for each quantity of output. The long-run average cost curve is U-shaped, reflecting economies of scale (or increasing returns to scale) when negatively-sloped and diseconomies of scale (or decreasing returns to scale) when positively sloped. The minimum point (or range) on the LRAC curve is the minimum efficient scale.

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POINT ELASTICITY: The relatively 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.< P>Point elasticity can be calculated in a number of different ways. Sophisticated economists, using sophisticated mathematical techniques (better known as calculus) can calculate point elasticity by taking derivatives of equations. Derivatives is fancy calculus talk for infinitesimally small changes.

     See also | elasticity | variable | arc elasticity | midpoint formula |


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LOGROLLING

The trading of votes to ensure a favorable outcome for two or more separate decisions. Logrolling occurs when each of two people agree to vote for the other's project to ensure that both are passed. A votes for B and B votes for A. Logrolling is commonly used when neither decision is able to obtain the necessary majority of the votes needed for passage on their own accord. Explicit logrolling is when each of two voters agree to cast separate votes for two separate programs. Implicit logrolling is when two separate programs or policies are combined into a single package, which is then subject to a single vote. Logrolling can generate either an efficient or an inefficient allocation of resources, meaning that efficiency is irrelevant to the logrolling process.

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