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Economies of Scale

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ECONOMIES OF SCALE
Explain how internal and external economies and diseconomies of scale arise as a firm expands its production.
INTRODUCTION
In the long run production period the firm can avoid the onset of diminishing returns by varying any or all of the factors of production. Economies of scale refer to the reduction in costs per unit of output as output increases and diseconomies of scale refers to the increase in average costs of production as output increases. This can be demonstrated through the long run average total cost curve (LRAC) curve (shown in the diagram below), which is an economic model represents the locus of points that join average costs associated with differing levels of output and plant sizes.
-LRAC curve

In the above diagram, if the firm produced output level OX, its average cost of production would be AC. If the firm expanded its plant size in the long run and produced at output level OY, the average cost of this level of output would fall to AC1. The average cost (AC1) at output OY is the minimum point (T) on the LRAC, and is the lowest average cost per unit that the firm can achieve for any given level of output with this scale of plant.

This minimum point (T) on LRAC in the diagram above is known as the technical optimum. The technical optimum is the most efficient level of production for a firm. At this point, average costs of production are at their lowest possible level. This is the achievement of an economy of scale by the firm. By having a bigger plant size, the average or unit cost of production falls from AC to AC1, and this is indicated by the downward sloping part of the LRAC curve between output levels OX and OY. Economies of scale results in further productivity which positively affects the economy as a whole. If the firm continued to increase its plant size and produced OZ level of output, the average cost would rise from AC1 to AC2. By increasing the level of output from OX to OY, the firm is experiencing economies of scale since larger plant sizes result in falling average costs. By increasing the level of output from OY to Oz, the firm experiences diseconomies of scale since average costs start to rise with increasing plant size.

There are two types of economies and diseconomies of scale: internal and external. Internal economies of scale refer to the cost of saving advantages that result from a firm becoming more efficient in allocating its internal resources that are within the firm’s direct span of control. Internal economies of scale are represented by the downward sloping section of the LRAC curve between points OX and OY in the diagram above. The cost saving advantages that result from a firm expanding its scale of operations include taking advantages of specialization of labour, investment in more efficient capital equipment, bulk buying which results in cheaper resources, markets for by-products and research and development. When a business reaches the cheapest possible cost to produce a certain number of units, they reach the technical optimum, represented by T in the diagram above. After this point, any more expansion will have a detrimental effect on productivity, which leads to internal diseconomies of scale.

Internal diseconomies of scale refer to increase in production costs per unit as output increase such as between points OY and OZ in the diagram above. Further expansion beyond technical optimum will lead to rising average costs, as the fixed factor is incapable of yielding further reductions in average costs. The disadvantages that cause per unit production costs to increase, once a firm expands its size past a certain point is due to managements of the firm become too complex and costly to coordinate as there is a lack of communication between different departments and layers of management, red tape can bog the decision making process, workplace relations are strained as management no longer know the staff personally and there is a decrease in managerial and administrative efficiency.

External economies of scale from reductions in average costs due to factors outside the firm’s direct control. These may be the result of growth in the industry in which the firm operates, causing a reduction in the long run average cost curved faced by all firms in the industry. This situation is illustrated in the diagram below. The LRAC curve shifts from LRAC1 to LRAC2, leading to lower average costs over the whole range of output. For example, at output level OX the average cost is reduced from OA to OB. External economies of scale are cost saving advantages that accrue to a firm because of outside influences, and are no the result of the firm changes its own scale of operations. External economies of scale can be increasing localization of industry, government inputs and growing, competitive and more sophisticated capital market.

External diseconomies of scale result from increase in average costs due to factors outside the firm’s direct control. They may be due to the growth of the industry in which the firm operates, leading to a rise in the long run average cost curve faced by firms in the industry. This is illustrates in the diagram below. The LRAC curve shits upwards from LRAC1 to LRAC3 leading to higher average costs over the whole range of output. For example, at output level OX the average cost is increase from OA to OC. External economies of scale usually result from the growth of the industry in which the firm is operating, but could also result from rapid growth across the entire economy. They are not the result of the firm changing its own scale of operations. External diseconomies of scale can be due to the growth of the industry causing increased pollution and congestion (for example China) and higher resource costs.

CONCLUSION

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