This thesis covers with problems of business ethics on both macroeconomic and microeconomic level. It is focused firstly on specific expressions of ethical business approaches but at the same time it represents theoretical methods how one can achieve them. This thesis states that the basic principle of business ethics is a principle of long-term existing and sustainability. Similarly, it refers to modern trends in ethical business such as sustainable consumption and Fair Trade. The thesis evaluates current situation in companies' ethical manner and moreover, it describes an example of the company Marks&Spencer as a one of the leading corporation in the area of business ethics. Accordingly, it is a proof that ethics and business are not an o...