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July 31, 2014 

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QUANTITY THEORY OF MONEY: A theory that states a given percentage change in the money supply leads to an equal percentage change in nominal gross domestic product. This theory is derived from the equation of exchange and is a cornerstone of the monetarists view of macroeconomics. A key assumption in translating the equation of exchange to the quantity theory of money is that the velocity of money is constant (or unaffected by the other key variables--output, price level, and money supply).

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VARIABLE INPUT:

An input whose quantity can be changed in the time period under consideration. The most common example of a variable input is labor. Variable inputs provide the means used by a firm to control short-run production. The alternative to variable input is fixed input. A fixed input, like capital, provides the capacity constraint in production. As larger quantities of a variable input, like labor, are added to a fixed input like capital, the variable input becomes less productive, which is the law of diminishing marginal returns.
A variable input is a resource or factor of production which can be changed in the short run by a firm as it seeks to change the quantity of output produced. Most firms use several variable inputs in short-run production, especially labor, material inputs, and energy. However, in the analysis of short-run production, a great deal of insight is achieved by focusing on the variable use of labor.

Short-Run Taco Production

As an illustration of variable inputs, consider the short-run production of Shady Valley's favorite lunch time meal, Super Deluxe TexMex Gargantuan Tacos (with sour cream and jalapeno peppers). The key variable input for Waldo Millbottom, the owner and proprietor of Waldo's TexMex Taco World, is the staff of workers.

In the day-to-day production of TexMex Gargantuan Tacos, Waldo is primarily interested in having a sufficient quantity of labor--waitpersons, kitchen help, buspersons, cashier, greeting host, chef, maitre d', valet parking attendants, and floor show performers.

To alter the production of TexMex Gargantuan Tacos, Waldo changes the size of his workforce. However, Waldo does not concern himself with the size of the restaurant, number of tables and chairs, amount of kitchen equipment, and available parking spaces. These are fixed inputs.

Usually Labor, But Not Always

The designation of labor as a variable input is not just an arbitrary choice made to ease the economic exposition of short-run production. Labor is usually an input that can be changed quickly. If a firm wants to add a half dozen additional machinists to its workforce, it can probably do so in a few weeks. However, if a firm wants to add 50,000 square feet of factory space, then the construction company probably needs a year or two to complete this job. In terms of short-run production for many firms, labor is typically variable and capital is typically fixed.

However, not all firms are typical. In some examples of short-run production, capital is the variable input and labor is the fixed input. One illustration is offered by the academic world of higher education. The labor of tenured faculty (with emphasis on "tenured") tends to be a fixed input in the production of education. By contrast, some forms of capital, especially computer equipment, are more easily changed and can be thought of as variable inputs in the production of education.

<= VARIABLE COSTVARIABLES =>


Recommended Citation:

VARIABLE INPUT, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2014. [Accessed: July 31, 2014].


Check Out These Related Terms...

     | production inputs | fixed input | production time periods | short run | long run | market period | very long run | product | production function | total product | marginal product | average product | law of diminishing marginal returns | marginal returns |


Or For A Little Background...

     | short-run production analysis | production | production cost | variables | labor | capital | firm | business | economic analysis | marginal analysis | factors of production | microeconomics |


And For Further Study...

     | long-run production analysis | division of labor | production possibilities | ownership and control | production stages | total product and marginal product | average product and marginal product | total product and average product | variable cost |


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