Tang San has been setting up a stall in the antique market for fifteen years and has set three rules: no selling of earthen things, no selling of things of unknown origin, and no selling of things that are more than three hundred years old. His peers laughed at him for being stupid. How could any antique dealer do this? Tang San didn't explain, he just set out and closed the stall on time every day. Until a young man brought a bronze item and asked him to check it, Tang San only glanced at it and told him to leave quickly and return the item to where it came from. The young man refused to accept it and took it to another store for appraisal. Something happened that night. The next day, a long queue formed in front of Tang San's stall. Those old guys finally understood - Tang San wasn't ignorant, he knew the rules.
