Elasticity of Demand measures the degree of responsiveness in quantity demanded due to change in own price of the product(price elasticity) or change in the income of the consumer(income elasticity)or change in the price of related goods(cross elasticity).There are many factors that affect Elasticity of Demand and market form is definitely an important factor affecting Elasticity of Demand.

Elasticity of Demand in different market forms is given below:

Market form	Degree of elasticity
Perfectly competitive market from (Characterised by the presence of large number of buyers and sellers all dealing in a homogeneous product)	Perfectly elastic demand in perfect competition, even a slight increase in price, causes demand to fall to zero.\({ E }_{ d }=\infty \).
Monopoly (Characterised by the presence of a single seller dealing in a product which has no close substitutes)	Inelastic demand in a monopoly, since the product does not have close substitutes, because of this, change in price does not have much effect on demand.\({ E }_{ d }<1.\)
Monopolistic competition (Characterised by the presence of large number of buyers and sellers dealing in a homogeneous but differentiated product)	Elastic demand in monopolistic competition, since the product has close substitutes, therefore, its demand tends to be elastic.\({ E }_{ d }>1.\)
Oligopoly (Characterised by the presence of few sellers selling an identical or differentiated product)	Highly elastic demand in oligopoly, interdependence between firms and availability of close substitutes makes demand highly elastic.\({ E }_{ d }>1.\) (In case of non-collusive oligopoly)