It is not permissible for the worker who does business with the capital in a Mudarabah project to have a fixed monthly salary; he is not entitled to anything except the share agreed upon between him and the financier.

There is nothing wrong with studying futures contracts and other financial contracts and dealings even if they are prohibited, subject to two conditions: 1. that the student should have enough Islamic knowledge to be able to distinguish between contracts that are permissible and those which are prohibited, 2- he should believe that what Allah has prohibited of such contracts is prohibited.

Deceiving the customer and telling him that the price of the item is fifty, and that the price has been reduced to thirty for a special occasion, such as `Eid for example, even though there has been no reduction at all, is clearly lying.

It is permissible for a Muslim to enter into a business partnership or work with a disbeliever or an evildoer. The Messenger of Allah gave Khaybar to the Jews to work the land and cultivate it, in return for which they would have half of its yield.