Linear Isoquant: This type assumes perfect sustainability of factors of production: a given commodity may be produced by using only capital, or only labour, or by an infinite combination of K and L.Input-Output Isoquant: This assumes strict complementary 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.