Bava Metzia 70: Charging Interest Non-Jews
Talking Talmud - A podcast by Yardaena Osband & Anne Gordon
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How being an orphan (minor) changes the terms of the prohibition against interest. Also, a new mishnah: fixed costs on what becomes a loan (via caring for an animal as an investment) cannot be paid back differently - to a Jew. When dealing with a non-Jew, extra payment is indeed allowed.