Whatever the objective of business firms, achieving optimum efficiency in production or minimizing cost for a given production is one of the prime concerns of the business managers. Thus, survival of a production firm in a competitive market depends on their ability to produce at a competitive cost.
- Business managers in their efforts to minimize the cost of production, are confronted with the questions such as, how can production be optimized or cost minimized?
- How does output behave when quantity of inputs/ technology of production changes? How can the least cost combination of inputs be achieved?
- Theory of production provides a theoretical answer to these questions. Let us first discuss some of basic concepts used in production analysis.
Meaning of Production:
- Production means transforming inputs (labour, machines, raw materials, time, etc) into an output. This concept of production is however, limited to manufacturing.
- In economic sense production process may take variety of forms other than manufacturing. For example, transporting a commodity from one place to another, besides, production process does not necessarily involve physical conversion of raw material into tangible goods. Some kinds of production involve an intangible input to produce. For example doctors, lawyers, social workers consultants, musicians etc. all are engaged in producing intangible goods.
Input:
- An input is a good or service that goes into the process of production.
- According to Baumol, an input is simply anything which the firm buys for use in its production or other process.
- Inputs are classified as fixed and variable inputs both in economic as well as in technical sense.
Fixed Input:
- In economic terms, a fixed input is one whose supply is inelastic in the short run. This implies that all of its user together cannot buy more of it in the short run. In technical sense, a fixed input is one that remains constant for a certain level of output.
Variable input:
- A variable input is one whose supply in the short run is elastic e.g. labour, raw material etc. Technically a variable input is one that changes with the change in the output. In the long run all the inputs are variable.
Short-Run and long –Run:
- The reference to time period in production process is important concept. The short run refers to the period of time in which supply of some of the inputs is fixed/ inelastic. For example, plant, building, machinery etc. The long run refers to the period of time in which supply of all the inputs is elastic/ variable.
Flow and Stock inputs:
- There are some inputs, if their services are not used; these cannot be stored such as labour, building, etc. If the services of labour are not used today, they cannot be stored until next day, next month or year. Such services are known as flow inputs/ resources.
- Some resources such as seed, fertilizer, feeds are however entirely used up in the production process. If these are not used in one period of production, they can be stored for later period. These are known as stock inputs/resources.
Output: An output is any good or service that comes out of production process.
Production function:
- The relation between inputs and outputs is production function. Production function is thus, a technical and mathematical relationship describing the manner and extent to which a particular product depends upon the quantities of input (s) or service(s) of input used.
- In production function, output is dependent on or determined by or related to or is the function of input(s) or use of resource(s). Production function is of two types; continuous and discrete.
Continuous production function:
- Continuous production function can be explained by response of yield to fertilizer or seeds where the doses of inputs and output can be split up to small units’ e. g. fertilizer can be applied to a hectare of land in quantities ranging from a fraction of kilogram up to hundreds of kilograms.
Discontinuous or discrete function:
- Such a function is obtained for inputs which are used in whole number such as a number of ploughings.
Production in short run:
- In short run, more or less units of a variable input are applied to a given quantity of a fixed input to produce different units of output of a product. There are three important concepts of product in this connection.
- Total product
- Average product
- Marginal product
- Total product of a variable factor is the maximum output produced by combining a given input of that factor with the fixed factor.
- Average product of a variable factor is simply the total product of the factor divided by the total units of the variable factor i.e. average output per unit of the factor
- Marginal Product is the change in the total product resulting from the use of one more or less unit of the variable factor. In other words marginal product measure the rate at which output changes as a result of change in variable factor.
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Input Used
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Total product
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Average Product
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Marginal Product
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1
|
50
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50÷ 1=50
|
-
|
|
2
|
90
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90÷ 2=45
|
40
|
|
3
|
120
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120÷ 3=60
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30
|
|
4
|
140
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140÷4=÷35
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20
|
|
5
|
150
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150÷5=30
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10
|
|
6
|
150
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150÷6 =25
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0
|
|
7
|
140
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140÷7 =20
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-10
|
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8
|
120
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120÷ 8=15
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-20
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- The law of production describes the ways which are technically possible to increase the level of production.
- The traditional production theory studies the marginal input output relationships under short as well long run conditions. In the short run input output relations are studied with one variable input, other inputs held constant.
- The law of production under these conditions is called ‘The law of Variable Proportions or The Laws of Returns to a Variable Input.
- On the other hand in the long run output can be increased by increasing all the factors. The response of output to changes in the size or scale of all the factors) in the same proportion) is called Returns to Scale.
Returns to a Factor or Production with one variable Input:
- “The proportional relationship between production and variable factor of production is known as returns to a factor.”
- On account of change in proportion of factors there will also be a change in total output but at different rates. Initially, when more units of variable factor are employed on fixed factor, output may increase at the increasing rate, and subsequently total output may increase at constant rate. But a stage must come when ultimately total output will increase at decreasing rate. Thus return to a factor exhibits three phases.
Increasing Return to factor:
- In short period, if with constant units of fixed factor, more units of variable factor are increased, then total output rises at an increasing rate, then this is called as increasing return to factor.
Constant Return to Factor:
- In short period, if with constant units of a factor, more units of the variable factors are increased, and then if total output rises at a constant rate, then it will known as constant return to factor. In this case marginal production remains constant.
Decreasing Return to a Factor:
- If with constant units of a fixed factor, more units of variable factor are added, with the result that total production increases at a decreasing rate, and then it will be known as decreasing return to a factor.
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