Which of the following is a reason for a firm having price elastic supply?

Price elasticity of supply (PES) measures the responsiveness of the quantity supplied to a change in price. Supply is elastic (PES > 1) if producers can easily increase output without a rise in cost or a time delay. Key factors determining PES include the availability of spare production capacity, the level of stocks, and the mobility of factors of production. A firm with plenty of spare capacity can readily increase production when prices rise, making its supply elastic.