In the area of investment, responsibility may be expressed via four types of ethical concern: value-based ethics resulting in the exclusion of so-called "vicious" companies from the investment portfolio; fructification-oriented ethics with a view to long-term investment; consequence-based ethics aimed at initiating a behavioural change in the investment target; and ethics envisaged as a discriminating criterion in the search of the best financial performance. No single formula of responsible investment is available, and the "responsible" approach necessarily implies the active involvement (...) of a free acting subject striving to tackle fundamental ethical issues. The practice of responsible investment cannot be reduced to simply applying a particular legal rule or mathematical formula. (shrink)