Use the following decision procedure:
1. Identify the genus of each countervalue.
2. Determine the governing volume or weight category, where applicable.
3. Check whether both, one or neither of the operative attributes coincide.
4. Where both coincide, test equality and no deferment; where one coincides, test no deferment.
5. If the contract is sarf, also apply the special session-possession rule.
This sequence helps avoid conflating value, quality, measurement and delivery.
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Riba: Operative Causes, Unequal Exchange and Deferral
Use the following decision procedure:
1. Identify the genus of each countervalue.
2. Determine the governing volume or weight category, where applicable.
3. Check whether both, one or neither of the operative attributes coincide.
4. Where both coincide, test equality and no deferment; where one coincides, test no deferment.
5. If the contract is sarf, also apply the special session-possession rule.
This sequence helps avoid conflating value, quality, measurement and delivery.