Ruling 2081 — Buying and Selling

If the extra thing that a seller receives is different to what he sells – for example, he sells 1 kilogram of wheat for 1 kilogram of wheat and 10 pence – it is still usury and unlawful. In fact, even if the seller does not receive any extra goods but makes it a condition that the buyer must do something for him, it is also usury and unlawful.