This course is devoted to study one or more of the following issues in depth, in an analytical and critical way, by referring to the old sources of Jurisprudence. Sale, leasing and hiring, usury, exchange, al-Salam, al-Khiyarat i.e. ‘the options’, borrowing, mortgage, al-Hiwalah i.e. transferring the responsibility of the debt from the debtor to a third party, bail, ‘power of attorney’ and so on.