Yesterday's daf presented gold coins as a currency. But if one borrows gold coins and replaces them with the same number of gold coins at a later date, surely one has not paid back the loan perfectly. The value of gold coins fluctuates. Perhaps the borrower will have paid interest, something not permitted.
The Gemara considers a number of different exchanges. Different coins, some minted and some not, are discussed as both commodities and as currencies. The rabbis also discuss which coins might desacralize second tithe produce, as was discussed in yesterday's daf.
Part of the rabbis' discussion focuses on the timing of the exchange; the specifics about when exactly which item was possessed by another. Our daf ends with a discussion about the use of older coins verses new coins. The older coins are darkened, we are told, and they are sometimes considered to be more valuable that newer coins.
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