Further discussion of the laws that pertain weights and measures, with a mnemonic to help them remember 11 beraitot, all pertaining to weights and measures, including those pertaining to the norms of the given place. For example, whether a serving might be flat or level, as compared to rounded or heaping. Plus, a caution against using "large" or "small" weights, with the goal, of course, against preventing cheating. Plus, punishments for those who messed with weighs and measures. Also, the injunction against metal weights and measures, and uneven levels, and less precise pacing for leveling the goods. Rabbi Yochanan ben Zakkai wasn't sure whether he should teach all of these halakhot in public - lest they teach the dishonest people how to be dishonest. But if he didn't teach them, what would that imply about the Torah and the knowledge of the Torah scholars?