Internal and External Diseconomies of Scale


The term diseconomies of scale refer to a situation where an increase in the size of the firm leads to a rising average cost.
Diseconomies of scale may be classified into internal diseconomies and external diseconomies of scale.
The major internal diseconomies of scale arise from its size of the firm, technical causes and managerial problems. When a firm achieves a size where it is producing at the lowest possible average cost it is said to be at its optimum size.
The optimum size will very over time as technological progress change the technique of production.
 In addition to this, more loaded men and machinery leads to machine fault and human failure cause breakdown of production.  When the size increases management becomes more complex and difficult. Managerial function of co-ordination, consultation and interdepartmental decision making will get delayed due to the size. 
There will be possibility of delay in implementation of decision within the organization. Delay in communication will reduce the involvement of the employees. 
Sorting out and solving the problems of lack of identification and recognition which reduce the commitment in long run.  

 There are some external diseconomies of scale in the form of disadvantages. 
There is shortage of labour which causes a wage rise.  
Increase in the demand for raw materials will also bid up prices. 
When there is heavy localization of industries, the land for expansion will become increasingly scarce.  Scarcity will cause an increase in the price to purchase land or to rent. 
Transport costs may also rise because of increased congestion. 

The change in output will cause a movement along the long run average cost curve. One of the most significant influences is external economies of scale.  If external economies are experienced, the long run average cost will shift down (output will be now be cheaper to produce).  Whereas external diseconomies of scale are encountered the long run average cost curve will move up (output will now be costlier to produce).  Improved technology would lower the long run average cost curve.
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