A key maxim of Islamic jurisprudence suggests that in the matter of commercial transactions, everything is deemed permissible unless explicitly stated otherwise. As long as the transacting parties adhere to the principles of Islamic jurisprudence while applying the benchmark to their transaction, it is acceptable to utilize a consensus methodology. In place of risk free rate or base rate of expected return on investment, some thinkers in Islamic finance suggest the possible use of Zakat rate.
In lease based contracts, such as Ijarah and Diminishing Musharakah, the rental indices can capture the true essence of pricing as per the nature of transaction.
Repo transactions are not compliant with Islamic principles due to the buyback nature of transaction plus the use of interest based securities as underlying assets. However, in commercial contracts where Islamic banks would like to earn return, there is need for a pricing benchmark to mitigate risk as well as ensure transparency in the contract.