The specifications must remove practical ambiguity. Quality should be described in relevant commercial terms, quantity must be fixed by the normal unit used for that commodity, and the delivery date and place must be stated clearly.
For example, if wheat is normally sold by weight, the contract should specify the exact weight and grade. A vague promise such as “good wheat later” is not enough.
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Advance-Purchase Sale (سَلَم): Why Future Delivery Is Allowed
The specifications must remove practical ambiguity. Quality should be described in relevant commercial terms, quantity must be fixed by the normal unit used for that commodity, and the delivery date and place must be stated clearly.
For example, if wheat is normally sold by weight, the contract should specify the exact weight and grade. A vague promise such as “good wheat later” is not enough.