Two interesting statistics that I found while researching payment systems and smartphones:
- The US has a mobile penetration rate of 103.1%, i.e. for every 100 citizens, there are over 103 mobile phones. The US has 327,577,529 mobile phones.
- There are around 600 million credit and debit cards in the US, a penetration rate of over 188%.
Sources
http://en.wikipedia.org/wiki/List_of_countries_by_number_of_mobile_phones_in_use
http://uk.businessinsider.com/why-mcx-is-blocking-apple-pay-2014-10