Extreme Cases:

These are situations where quantity supplied is either completely responsive or completely unresponsive to a change in the market price of a commodity. The supply of a commodity is perfectly elastic when the price elasticity of supply coefficient is equal to infinity (∞). This is where a change in price causes a propertionately infinitely larger change in quantity supplied. On the other hand,

supply of a commodity is perfectly inelastic when the price elasticity of supply coefficient is equal to zero. This means a change in price elasticity of supply coefficient is equal to zero. This means a change in price of a commodity does not cause any change in quantity supplied.