A new mishnah! The erosion of minted coins, and its diminished value, with the potential for fraud in using it, as the metal is worn away. Subject to a dispute between our mishnah and a beraita. Also, the Gemara in the second part of the mishnah - garments vs. coins, and how they're handled in the village vs. cities, where the moneylenders were available to check the coins. Plus, the application of a "generosity of spirit."