introduction It also known as "Input - Input relationship and principle of least cost combination ". It concerned with managerial problem " How to produce " and determination of least cost combination of resources . The goal of this relationship is to minimization of input costs. This relationship deals with resource combination & substitution. In this relationship, output is kept constant, input is varied in quantity to achieve given level of output. It can be expressed as - Y= f (X1. Xi IX3, X4................. Xn ) This relationship can be explained by the Principle of Factor Substitution
Important Basic Terms & Concepts ISO-QUANT - It is made from two words i.e. ISO means equal and quant means quantity. It is "A curve representing all the possible combinations of two inputs/ resources (x1,x1) that can produce the same (given) level of output". See following table
Properties of Iso -quant I so -quant curves are downward / negatively sloping. I so quant's are convex to the origin They never intersect each other. Higher I so -quants represent higher level of output.
Marginal Rate of Technical Substitution It refers to the amount by which one resource is reduced as another resource is increased by one unit . It may be defined as the rate at which marginal unit of an input can be substituted for another input making the level of output remain the same . It may be expressed as : MRTS of Xl for X2 MRTS of X2 for Xl X1X2 = dX 2/ dX 1 X2X1= dX 1 I dX 2 MRTS = Number of units of replaced resource Number of units of added resource
Substitutes and Complements Substitutes: A range of input combinations which will produce a given level of output. When one factor is reduced in quantity, while another factor must always be increased. Ex: Tea & coffee, Manure & fertilizer, FYM & Vermi compost Complements : Two resources which are used together are called complements. In the case of complements, reduction in one factor cannot be replaced by an increase in another factor. Ex: Tractor and driver, pair of bullocks and laborer
lso -cost Line It al so known as price line, budget line, iso -outlay line, factor cost line. I so -cost line defines all possible combinations of two resources ( X1 and Xi ) which can be purchased with a given outlay of funds . Characteristics of Price line As the total outlay increases, the iso -cost line moves further away from the origin. Price line is a straight line because input prices do not change with the quantity purchased. The slope of price line indicates the ratio of factor prices (price ratio)
Example - suppose that a producer has a total budget of Rs 120 and for producing a certain level of output (100 Kg), he has to spend this amount on 2 factors A and B. Price of factors A and B are Rs 15 and Rs . lO respectively.
ISO-CLINE A line connecting all the least cost combination of inputs for all output levels is called iso -cline. The iso -cline passes through all the iso -quants at points where they have the same slope .