Suppose 20 fulus circulate per dirham, and a changer offers ten fulus plus silver weighing half a dirham minus one grain.
If the buyer assigns one half of his dirham to the ten fulus and the other half to the smaller silver piece, the unequal same-silver problem appears.
If the buyer requests the customary half-dirham's worth of fulus and the silver piece without preallocating the two halves, Quduri's second construction can be valid. Mutual possession remains a separate requirement.
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Applied exercise: two quotations of the same deal
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
Suppose 20 fulus circulate per dirham, and a changer offers ten fulus plus silver weighing half a dirham minus one grain.
If the buyer assigns one half of his dirham to the ten fulus and the other half to the smaller silver piece, the unequal same-silver problem appears.
If the buyer requests the customary half-dirham's worth of fulus and the silver piece without preallocating the two halves, Quduri's second construction can be valid. Mutual possession remains a separate requirement.