There are 1.06 billion credit cards in use in the U.S. and 2.8 billion in worldwide. In the UK there were 32.3 million people with a credit or charge card in 2016, about six in ten adults. There were 368.92 billion card transactions worldwide in 2018. As credit card use grows, so too must credit card debt, and so must the amount of revolving debt. New technology can have a large impact on the way that people pay, and new technology can also have a big impact.”]