Talking Talmud Yardaena Osband & Anne Gordon

The daf has two mishnayiot. The first describes circumstances when a higher price is allowed to be paid. The second discusses partial payment on a field and does the buyer or seller have access to the produce.

More on advance payments... Where the product has to already be in one's tradition (in contrast to gourds, for example, that still need to grow). Plus, a specified amount as an advance discount that isn't used immediately is later considered interest. Also, a new mishnah! One who borrows money from another cannot allow the lender to stay in his courtyard, for example, lest it smack of interest (with some exception, based on the circumstances).

Who is Rabbi Oshaya l, an amora, and what is his relationship with tannaitic literature. The daf discusses how a seller can use produce to pay a debt.

Is interest recoverable? It's a machloket, of course. Plus, how that plays out in the Jewish vs. non-Jewish courts, and the ways they functioned differently. Also, elaborating on the mishnah's case of rising market price, and a trade for another product, which (in this specific case) turns the seller into the borrower...

Chapter 5! A new mishnah, a new topic - moneylending, and the prohibition against taking interest. Also, the sidebar explanation for addressing the exodus from Egypt in the context of interest.

The final two mishnahs of the fourth perek deal with deceptive practices shopkeepers may not do because they hurt the buyer.