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April 22, 2018 

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LONG-RUN MARGINAL COST: The change in the long-run total cost of producing a good or service resulting from a change in the quantity of output produced. Like all marginals, long-run marginal cost is the increment in the corresponding total. What's most notable about long-run marginal cost, however, is that we are operating in the long run. Unlike the short run, in which at least one input is fixed, there are no fixed inputs in the long run. As such, there is only variable cost. This means that long-run marginal cost is the result of changes in the cost of all inputs.

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DECREASING RETURNS TO SCALE:

A given proportional change in all resources in the long run results in a proportional smaller change in production. Decreasing returns to scale exists if a firm increases ALL resources--labor, capital, and other inputs--by a given proportion (say 10 percent) and output increases by less than this proportion (that is, less than 10 percent). This is one of three returns to scale. The other two are increasing returns to scale and constant returns to scale.
Decreasing returns to scale results if long-run production changes are less than the proportional changes in all inputs used by a firm.

Suppose, for example, that The Wacky Willy Company employs 1,000 workers in a 5,000 square foot factory to produce 1 million Stuffed Amigos (those cute and cuddly armadillos, tarantulas, and scorpions) each month. Decreasing returns to scale exists if the scale of operation expands to 2,000 workers in a 10,000 square foot factory (a doubling of the inputs) and production increases by less than 2 million Stuffed Amigos.

The anticipated pattern for most production activities is that increasing returns to scale emerge for relatively small levels of production, which is then followed by constant returns to scale and decreasing returns to scale.

Decreasing returns to scale are the flip slide of diseconomies of scale. Whereas diseconomies of scale focus on changes in average cost, decreasing returns to scale focus on production. Diseconomies of scale indicate that long-run average cost increases, which corresponds to decreasing returns to scale in terms of output.

Do not confuse decreasing returns to scale with decreasing marginal returns. While these phrases sound similar, they are quite different. Decreasing returns to scale relate to the long run in which all inputs are variable. Decreasing marginal returns related to the short run in which one or more input is variable and one or more input is fixed. The existence of fixed inputs in the short run gives rise to decreasing marginal returns. In particular, decreasing marginal returns result because the capacity of the fixed input or inputs is being reached. However, in the long run, there are no fixed inputs.

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DECREASING RETURNS TO SCALE, AmosWEB Encyclonomic WEB*pedia, http://www.AmosWEB.com, AmosWEB LLC, 2000-2018. [Accessed: April 22, 2018].


Check Out These Related Terms...

     | long-run production analysis | returns to scale | increasing returns to scale | constant returns to scale | long-run, microeconomics |


Or For A Little Background...

     | short-run production analysis | production inputs | production time periods | product | production | production cost | variables | labor | capital | law of supply | supply | principle | business | marginal analysis | factors of production | microeconomics |


And For Further Study...

     | total product | marginal product | average product | production function | price elasticity of supply | division of labor | production possibilities | law of increasing opportunity cost | law of diminishing marginal returns | marginal returns | production stages | very long-run, microeconomics |


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