Final answer:
A perfectly elastic supply curve is one that is vertical and represents suppliers' willingness to supply any quantity at a given price.
Step-by-step explanation:
A perfectly elastic supply curve is one in which the supply curve is a. Vertical. In economics, elasticity measures how responsive supply or demand is to changes in price. When a supply curve is perfectly elastic, it means that even a small change in price will cause an infinite change in quantity supplied. This is depicted as a vertical line on a graph, indicating that suppliers are willing to supply any quantity at a given price.