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Returns to scale
1.
LAWS OF RETURNS
TO SCALE The concept of returns to scale is a long run phenomenon. In this case, we study the change in output when all factor inputs are changed or made available in required quantity. An increase in scale means that all factor inputs are increased in the same proportion. In returns to scale, all the necessary factor inputs are increased or decreased to the same extent so that whatever the scale of production, the proportion among the factors remains the same. THREE PHASES OF RETURNS TO SCALE Generally speaking, we study the behavior pattern of output when all factor inputs are increased in the same proportion under returns to scale. Many economists have questioned the validity of returns to scale on the ground that all factor inputs cannot be increased in the same proportion and the proportion between the factor inputs cannot be kept uniform. But in some cases, it is possible that all factor inputs can be changed in the same proportion and the output is studied when the input is doubled or tripled or increased five-fold or ten-fold. An ordinary person may think that when the quantity of inputs is increased 10 times, output will also go up by 10 times. But it may or may not happen as expected. It may be noted that when the quantity of inputs are increased in the same proportion, the scale of output or returns to scale may be either more than equal, equal or less than equal. Thus, when the scale of output is increased, we may get increasing returns, constant returns or diminishing returns. When the quantity of all factor inputs are increased in a given proportion and output increases more than proportionately, then the returns to scale are said to be increasing; when the output increases in the same proportion, then the returns to scale are said to be constant; when the output increases less than proportionate, then the returns to scale are said to be diminishing. Sl. No. Scale Total Product Marginal Product (in Units) (in units) 1 1 Acre of land + 3 labor 5 5 2 2 Acre of land + 5 labor 12 7 3 3 Acre of land + 7 labor 21 9 4 4 Acre of land + 9 labor 32 11 5 5 Acre of land + 11 labor 43 11 6 6 Acre of land + 13labor 54 11 7 7 Acre of land + 15 labor 63 9 8 8 Acre of land + 17 labor 70 7 It is clear from the table that the quantity of land and labor (Scale) is increasing in the same proportion, i.e. by 1 acre of land and 2 units of labor throughout in our example. The output increases more than proportionately when the producer is employing 4 acres of land and 9 units of labor. Output increases in the same proportion when the quantity of land is 5 acres and 11units of labor and 6 acres of land and 13 units of labor. In the later stages, when he employs 7 & 8 acres of land and 15 & 17 units of labor, output increases less than proportionately. Thus, one can clearly understand the operation of the three phases of the laws of returns to scale with the help of the table. 1 © Sachin Pourush
2.
Diagrammatic representation In the
diagram, it is clear that the marginal returns curve slope upwards from A to B, indicating increasing returns to scale. The curve is horizontal from B to C indicating constant returns to scale and from C to D, the curve slope downwards from left to right indicating the operation of diminishing returns to scale. Factor units Employed Increasing Returns to Scale: Increasing returns to scale is said to operate when the producer is increasing the quantity of all factors [scale] in a given proportion, output increases more than proportionately. For example, when the quantity of all inputs are increased by 10%, and output increases by 15%, then we say that increasing returns to scale is operating. In order to explain the operation of this law, an equal product map has been drawn with the assumption that only two factors X and Y are required. In the diagram, Factor X is represented along OX- axis and factor Y is represented along OY axis. The scale line OP is a straight line passing through the origin on the Iso Quant map indicating the increase in scale as we move upward. The scale line OP represent different quantities of inputs where the proportion between factor X and factor Y is remains constant. When the scale is increased from A to B, the return increases from 100 units of output to 200 units. The scale line OP passing through origin is called as the “Expansion path”. Any line passing through the origin will indicate the path of expansion or increase in scale with definite proportion between the two factors. It is very clear that the increase in the quantities of factor X and Y [scale] is small as we go up the scale and the output is larger. The distance between each Iso Quant curve is progressively diminishing. It implies that in order to get an increase in output by another 100 units, a producer is employing lesser quantities of inputs and his production cost is declining. Thus, the law of increasing returns to scale is operating. Causes for Increasing Returns to Scale 2 © Sachin Pourush
3.
Increasing returns to
scale operate in a firm on account of several reasons. Some of the most important ones are as follows: 1. Wider scope for the use of latest tools, equipments, machineries, techniques etc to increase production and reduce cost per unit. 2. Large-scale production leads to full and complete utilization of indivisible factor inputs leading to further reduction in production cost. 3. As the size of the plant increases, more output can be obtained at lower cost. 4. As output increases, it is possible to introduce the principle of division of labor and specialization, effective supervision and scientific management of the firm etc would help in reducing cost of operations. 5. As output increases, it becomes possible to enjoy several other kinds of economies of scale like overhead, financial, marketing and risk-bearing economies etc, which is responsible for cost reduction. It is important to note that economies of scale outweigh diseconomies of scale in case of increasing returns to scale. Constant Returns to Scale Constant returns to scale is operating when all factor inputs [scale] are increased in a given proportion, output also increases in the same proportion. When the quantity of all inputs is increased by 10%, and output also increases exactly by 10%, then we say that constant returns to scale are operating.In the diagram, it is clear that the successive Iso Quant curves are equi distant from each other along the scale line OP. It indicates that as the producer increases the quantity of both factor X and Y in a given proportion, output also increases in the same proportion. Economists also describe Constant returns to scale as the Linear homogeneous Production function. It shows that with constant returns to scale, there will be one input proportion which does not change, what ever may be the level of output. Causes for Constant Returns to Scale In case of constant returns to scale, the various internal and external economies of scale are neutralized by internal and external diseconomies. Thus, when both internal and external economies and diseconomies are exactly balanced with each other, constant returns to scale will operate. Diminishing Returns to Scale 3 © Sachin Pourush
4.
Diminishing returns to
scale is operating when output increases less than proportionately when compared the quantity of inputs used in the production process. For example, when the quantity of all inputs are increased by 10%, and output increases by 5%, then we say that diminishing returns to scale is operating. In the diagram, it is clear that the distance between each successive Iso Quant curve is progressively increasing along the scale line OP. It indicates that as the producer is increasing the quantity of both factor X and Y, in a given proportion, output increases less than proportionately. Thus, the law of Diminishing returns to scale is operating. Causes for Diminishing Returns to Scale Diminishing Returns to Scale operate due to the following reasons- 1. Emergence of difficulties in co-ordination and control. 2. Difficulty in effective and better supervision. 3. Delays in management decisions. 4. Inefficient and mis-management due to over growth and expansion of the firm. 5. Productivity and efficiency declines unavoidably after a point. Thus, in this case, diseconomies outweigh economies of scale. The result is the operation of diminishing returns to scale. The concept of Returns to Scale helps a producer to work out the most desirable combination of factor inputs so as to maximize his output and minimize his production cost. It also helps him, to increase his production, maintain the same level or decrease it depending on the demand for the product. 4 © Sachin Pourush
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