《明史·志·卷五十六》
到了末世，商人在正式茶引之外，多给赏由票，使之得以私自流行。
洎乎末造，商人正引之外，多给赏由票，使得私行。
At the end of the dynasty, in addition to the official tea requisition certificate, the merchants more often handed out a reward ticket, which could be traded in private.