as "tawarruq, commodity murabahas, Malaysian Islamic private debt securities, and Islamic short-sales". Exploitation is involved when high fees are charged for "doing nothing more substantial than mimicking conventional banking /finance products". Haram activities are not avoided when banks (following the customary practice) simply take the word of clients/financees/borrowers that they will not use funds for unIslamic activities. Others (such as convert Umar Ibrahim Vadillo) agree that the Islamic banking movement has failed to follow the principles of shariah law, but call for greater strictness and greater separation from the non-Muslim world. Overview of products, contracts, etc. Banking makes up most of the Islamic finance industry. Banking products are often classified in one of three broad categories, two of which are "investment accounts": Profit and loss sharing modes—musharakah and mudarabah—where financier and the user of finance share profits and losses, are based on "contracts of partnership". "Asset-backed financing", (also known as trade-based financing" or "non-PLS financing"), "debt-like instruments" which are based on "debt-based contracts" or "contracts of exchange". They are structured as sales and allow for "the transfer of a commodity for another commodity, the transfer of a commodity for money, or the transfer of money for money". They involve the financing "purchase and hire of goods or assets and services", and like conventional loans repayment is deferred, increased, and made on a "fixed-return basis". Unlike conventional loans, the fixed return is called "profit" or "markup", not "interest". According to Feisal Khan, "virtually every" Islamic banking advocate argues that these "non-non-participatory" forms of finance are acceptable only as "an interim measure" as Islamic banking develops, or for situations such as small and personal loans where participatory financing is not practical. Faleel Jamaldeen states that debt-based contracts are often used to finance not-so-minor purchases (homes, cars, etc.) for bank customers. These instruments include mark-up (murabaha), leasing (ijara), cash advances for the purchase of agricultural produce (salam), and cash advances for the manufacture of assets (istisna'''). the third category consists of Modes based on contracts of safety and security, include safe-keeping contracts (wadi’ah) for current deposits (called checking accounts in the US), and agency contracts (wakalah). Current account deposits are regarded as trusts or safe-keeping and offer the depositors safety of their money against the bank's guarantee to return their funds on demand. (A current account the customer earns no return, but sources do not agree over whether the bank is allowed to