Here arises another question.

Here arises another question. Is it allowed that other people take advantage of the desperate need of a man in distress and purchase his goods at a price much less than the fair price and regard action as legal? Of course, not! Now a further question arises. Is this transaction, though forbidden, still valid, and if valid, will the exploiter be asked to make up the loss and pay the actual market price? All these points require further discussion.

Mature understanding (rushd) is a prerequisite condition of validity, but not that of the applicability of law. Under Islamic law, it is necessary…