What the Scholars Say
While scholars have stated that price (thaman) must be fully determined at the time of contract, the means of this determination are subject to some disagreement. For many jurists, it is not valid to sell at "the market determined price" or "at the price at which people sell" or a the price "that so and so chooses" since the price is unknown. But this sort of sale, "market order" can have the price specified in such a way that there can be little chance of disagreement.
Imam Ahmad ruled for the validity of sale at the price to be determined by the market at a specified future time, without specifying that price at the time of the contract due 'Urf.
Ibn Taymiyyah states that a price may be determined in exact figures or it may be thaman al-mithl, the price that other people pay, or the market price, provided that only one price prevails, or it may be determined in an manner that the parties find agreeable and is clear enough to eliminate doubts. To avoid confusion, what is referenced in this case is a "market determined price at the item at the conclusion of the sale", not any future price.
He gives as example the ijma' of scholars on the validity of assigning a proper dower (mahr al mithl) in a contract for marage. The idea of proper price (thaman al mithl) is analogous to that of proper dower. He states that there is nothing in Quran or Sunnah against the concept and general custom has validated it.
Ibn al Qayyim hae also favored permitting this type of sale. Other scholars of note who permitted bay' bi sir' al suq include: Al Khatib al Shirbini (Shafii) Abu Ishaq a Shirazi (Shafii), Ibn Juzayy (Maliki), Al Dardir (Maliki), Mari Ibn Yusuf (Hanbali), Ibn Qayyim al Jawziyya (Hnbali), Ibn Hazm all have approved. Ahmad Ibn Hanbal issued an afirmative fatwa on it.
Md Yusuf Musa supported the Hanbali position by observing that specification of an exact figure is not a Shariah requirement. Specifying market prevailing price on a specific date is clear and does not leave room for disagreement and dispute. This view has found support from Ahmad Yusuf Sulayman and Ahmad Hasan. In this there is little chance of excessive gharar in this.
What it means
So, for most, the sale need not refer to a set or specific price in order to be valid. It is still valid and there is no excessive gharar as long as the price is set in a way that is acceptable to both parties and cannot lead to disputes. According to Kamali, this lends credence to his argument that Futures should be acceptable. The sheer fact that futures are extremely liquid and price determination is rarely (never?) an issue in any futures market does give them more justification, certainly but there are many more steps to the argument and many are more debatable.
The acceptability of Bay' bi Sir' a Suq has direct impact on Istijrar (please click for earlier post), of course, since in Istijrar, individual or Sub-Murabahas refer to prices only fixed at the time of execution of that Sub-Murabaha. No offer and acceptance or needed, and price is set only by reference to an underlying market.
It probably does not help with anything illiquid, say Tier 3 assets, priced by model. It appears that this price-referencing mechanism applies only to those fungibles for which there is a price.
Mostly paraphrased from:
Dr Wahbah al-Zuhayli, Financial Transactions in Islamic Jurisprudence, vol 1, translated by Md El-Gamal, Dar al Fikr, Damascus, 2002, p 107.
Md Hashim Kamali, Islamic Commercial Law: An Analysis of Futures and Options, Islamic Texts Society, 2000, pp95-96.
See also Islamic Law on Commercial Transactions, Prof Dr Razal Hj Nawawi, CT Publications, Malaysia, 1999, p 97. (Mustapha al Zarqa', Aqd al Bay', is quoted)
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