Today's increasing environmental problems are closely related to how we organise economic activities. This paper departs from the assumption that in order to reach sustainable economic organisation, we must address the dominating Market Discourse (MD), guiding mainstream organising. To understand whether reconceptualisations are sufficient or if changes in underlying ethics are needed, we compare the MD with strong and weak sustainability discourses. The analysis suggests that there is a need for changes in underlying assumptions as well as reconceptualisation of economic organisation that coheres with these assumptions. We also discuss how the related concepts of allocative, governance and throughput efficiency permeates MD, and, as principles for organisation, contribute to the inertia in working towards sustainable economic organisation.