Managers often have discretion in interpreting their ethical requirements, and they should seek democratic guidance in doing so. The undemocratic nature of managerial ethical discretion is shown to be a recurring problem in business ethics. Joseph Heath’s market failures approach (MFA) is introduced as a theory better positioned to deal with this problem than other views. However, due to epistemic uncertainty and conceptual indeterminacy, the MFA is shown to allow a much wider range of managerial discretion than initially appears. The (...) paper explores how this range can be narrowed down with democratic input, comparing models based on formal state institutions and on the informal public sphere. A case study from the pharmaceutical industry illustrates the merits of the informal public sphere approach. (shrink)