Matching two dirhams against only one dirham would create the problem of inequality in a same-silver exchange. Quduri's construction reads the composite contract through legally permissible cross-genus correspondences.
Jurist disagreement: Fath al-Qadir also transmits the opposing view of Zufar and al-Shafi‘i for this composite construction. It should not be presented as an undisputed ruling across schools.
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Why the cross-allocation matters
Bab al-Sarf: Mixed Currency Exchanges, Debased Coins and Obsolescence
Matching two dirhams against only one dirham would create the problem of inequality in a same-silver exchange. Quduri's construction reads the composite contract through legally permissible cross-genus correspondences.
Jurist disagreement: Fath al-Qadir also transmits the opposing view of Zufar and al-Shafi‘i for this composite construction. It should not be presented as an undisputed ruling across schools.