Do trade goods (Urood Al-Tijarah) combine with gold or silver to complete their respective Nisabs?

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Trade goods are combined (tudammu) with either gold or silver to complete their Nisab, and there is no known disagreement on this matter. This combination occurs because Zakat is levied upon the value of the goods, which is then aggregated with the value of the precious metal. If one possesses gold, silver, and trade goods, all three must be combined to complete the Nisab, as the goods are added to each metal, thus necessitating the combination of all three.