According to paragraph 3, what is illustrated when the author mentions the case of commuters

* Hướng dẫn giải

Dẫn chứng: But the new system could prove to be a “disruptive technology” as far as the banks are concerned. If payments for a few coffees, a train ticket and a newspaper are made every day by a commuter with a mobile, this will not appear on their monthly credit card statements but on their mobile phone statements.