"economically indistinguishable from traditional, debt- and interest-based finance." Since "there is principal and a payment plan, there is an implied interest rate", based on conventional banking interest rates such as LIBOR. Others complain that in practice most "murabaḥah" transactions are merely cash-flows between banks, brokers and borrowers, with no actual buying or selling of commodities. Bai' muajjal, also called bai'-bithaman ajil, or BBA, (also known as credit sale or deferred payment sale) In Bai' muajjal (literally "credit sale", i.e. the sale of goods on a deferred payment basis), the financier buys the equipment or goods requested by the client, then sells the goods to the client for an agreed price, which includes a mark-up (profit) for the bank and is paid either in installments over a pre-agreed period or in a lump sum at a future date. The contract must expressly mention cost of the commodity and the margin of profit is mutually agreed. Bia'muajjal was introduced in 1983 by Bank Islam Malaysia Berhad. Because in Islamic finance the markup in murabahah is charged in exchange for deferred payment, bai' muajjal and murabahah are often used interchangeably, (according to Hans Visser), or "in practice ... used together" (according to Faleel Jamaldeen). However, according to another (Bangladeshi) source, Bai' muajjal differs from Murabahah in that the client, not the bank, is in possession of and bear the risk for the goods being purchased before completion of payment. And according to a Malaysian source, the main difference between BBA (short for bai'-bithaman ajil) and murabaha—at least as practiced in Malaysia—is that murabaha is used for medium and short term financing and BBA for longer term. Bai' al 'inah (sale and buy-back agreement) Bai' al inah (literally, "a loan in the form of a sale"), is a financing arrangement where the financier buys some asset from the customer on spot basis, with the price paid by the financier constituting the "loan". Subsequently, the asset is sold back to the customer who pays in installments over time, essentially "paying back the loan". Since loaning of cash for profit is forbidden in Islamic Finance, there are differences of opinion amongst the scholars on the permissibility of Bai' al 'inah. According to the Institute of Islamic Banking and Insurance, it "serves as a ruse for lending on interest", but Bai' al inah is practised in Malaysia and similar jurisdictions.The emergence of Islamic financing based on the