Gold ↔ gold: equal weights and immediate receipt on both sides.
Silver ↔ silver: equal weights and immediate receipt on both sides.
Gold ↔ silver: equal weights are not required, but both receipts remain obligatory in the session.
Rather than memorising disconnected cases, distinguish equality from delay: differing genera remove the equality requirement, not the session-possession requirement.
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Comparing two exchange cases
Bab al-Sarf: Precious-Metal Exchange, Possession and Composite Goods
Gold ↔ gold: equal weights and immediate receipt on both sides.
Silver ↔ silver: equal weights and immediate receipt on both sides.
Gold ↔ silver: equal weights are not required, but both receipts remain obligatory in the session.
Rather than memorising disconnected cases, distinguish equality from delay: differing genera remove the equality requirement, not the session-possession requirement.