The religion of Islam has a strong and well developed system of business ethics.

From An Islamic Approach to Business Ethics –

Ethics in Islam

Islam places the highest emphasis on ethical values in all aspects of human life. In Islam, ethics governs all aspects of life. Ethical norms and moral codes discernable from the verses of the Holy Qur’an and the teachings of the Prophet (sws) are numerous, far reaching and comprehensive. Islamic teachings strongly stress the observance of ethical and moral code in human behaviour. Moral principles and codes of ethics are repeatedly stressed throughout the Holy Qur’an. Besides, there are numerous teachings of the Prophet (sws) which cover the area of moral and ethical values and principles. Says the Holy Qur’an:

You are the best nation that has been raised up for mankind; You enjoin right conduct, forbid evil and believe in Allah. (3:110)

The Prophet (sws) also says:

I have been sent for the purpose of perfecting good morals. (Ibn Hambal[1], No: 8595)

This goes without saying that there is a general consensus among human beings about certain fundamental ethical values. However, the Islamic ethical system substantially differs from the so-called secular ethical systems as well as from the moral code advocated by other religions and societies. In the Islamic scheme of things, adherence to moral code and ethical behaviour is a part of I%man (faith) itself. According to the Islamic teachings, Muslims have to jealously guard their behaviour, deeds, words, thoughts, feelings and intentions. Islam asks its believers to observe certain norms and moral codes in their family affairs; in dealings with relatives, with neighbours and friends; in their business transactions; in their social affairs, nay in all spheres of private and public life.

The You Tube site, TheIslamicWorkplace (all one word), has a number of brief lectures on the subject. You should watch if only for the parables used in the teaching.