Linear Isoquant: This type assumes perfect substitutability of factors of production: a given commodity may be produced by using only capital, or only labour, or by an infinit

…e combination of K and L.Input-Output Isoquant: This assumes strict complementarity[that is, zero substitutability] of the factors of production. The isoquant take the shape of a right angle. This type of isoquant is also called 'Leontief isoquant' after Leontief, who invented the input-output ananlysis.Kinked Isoquant: This assmes limited substitutability of K and L. There are only a few processes for producing any one commodity. Substitutability of factors is possibleonly at the kinks. This form is also called 'activity analysis-isoquant' or 'linear-programming isoquant', because it is basically used in linear programming.Smooth , Convex Isoquant: This form assumes continuous substitutability of K and L only over a certain range, beyond which factors cannot substitute each other. The isoquant appears as a smooth curve convex to the origin. (MORE)