For the source text click/tap here: Bava Metzia 52
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The Mishna on our daf discusses ona’ah – unfair business transactions (see above, daf 50) – in a case where a coin had less value than its true weight. In this case, while Rabbi Shimon rules that ona’ah remains at one-sixth the value of the coin, other tanna’im suggest that it is a smaller amount. Rabbi Meir suggests that ona’ah will be at one-twenty-fourth the value of the coin and Rabbi Yehuda suggests one-twelfth.
Coins erode with use and using them as if new could constitute fraud.
Coins that still circulate, albeit with difficulty, should be accepted, and the one who doesn't is called stingy. After this, they should be used for necklaces or destroyed.
We explore the depreciation and devaluation of currency in antiquity.