In China a fapioa – the official receipt used for expense claims has a resale face value of 2 – 10% of face value – leaving one behind in a restaurant or taxi is the equivalent of giving a tip (in a culture where tipping is uncommon) and not requesting one allows the person or establishment to avoid ringing the exchange through a cash register. There are two primary practices around handing out fapioa: the first is that they are printed to the exact value; the second is that the seller takes an equivalent sum from book of fapioa that contains various denominations.
