Fath al-Qadir relates the disciples' treatment of obsolete fulus to the disagreement just studied over obsolete mixed coins. Abu Yusuf assesses the value on the contract date, while Muhammad uses the last date of circulation.
If the historical coins were worth 500 at contracting and 450 when circulation ended, the two assessments differ in valuation date. The figures only illustrate the classical distinction, not a blanket rule for modern inflation.
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The disciples and substituted value
Bab al-Sarf: Circulating Fulus, Obsolete Coins and Money-Changer Exchanges
Fath al-Qadir relates the disciples' treatment of obsolete fulus to the disagreement just studied over obsolete mixed coins. Abu Yusuf assesses the value on the contract date, while Muhammad uses the last date of circulation.
If the historical coins were worth 500 at contracting and 450 when circulation ended, the two assessments differ in valuation date. The figures only illustrate the classical distinction, not a blanket rule for modern inflation.