Paul Mozur, Chia Forgets Wallet; Across Urban areas, mobile payments are making cash all but obsolete. New York Times, July 17, 2017.
Excerpt in the window of print: Technology that turns smartphones into wallets is now 'a default way of life.'
My comment: Some stores in US charge customers extra when they use credit or debit cards instead of cash. Not because they evade tax, but because Visa or Mastercard charge merchants a certain percentage of transactions. Don't this happen in China?