How do they not run out of numbers? According to this random image I found on the internet, each bank has a space of one billion card numbers. If you have ten

How do they not run out of numbers? According to this random image I found on the internet, each bank has a space of one billion card numbers. If you have ten million customers, say you're going to run out of these very quickly. http://www.financetwitter.com/wp-content/uploads/2014/08/Cracking-Credit-Card-Numbers-MasterCard.jpg http://www.financetwitter.com/wp-content/uploads/2014/08/Cra...