An internet service provider (ISP) can lower their average cost to provide internet to a region by having more and more customers. There is an initial high cost to put down infrastructure, but the most significant cost is maintaining the equipment and providing the actual internet connection.

a. Can an ISP lower their average cost by having more customers?
b. Does an ISP's average cost decrease when they have more customers?
c. Is the average cost for an ISP reduced with a larger customer base?
d. Can more customers help decrease an ISP's average cost?