We also acknowledge the kind support of UKSA when developing the initial draft paper, as well as the support of CSA and NASA for the co-organisation of the OECD Workshop on the Economics of Space Debris, hosted by the CSA in Montreal in June 2019. The workshop gathered 45 experts from ministries, space agencies and other administrations, international organisations, industry and academia. We warmly thank the experts who participated and recognise their contributions to this paper.We also appreciate the detailed comments of the individual members of the Space Forum's Steering Group on drafts of this paper, and from the experts in their respective organisations. We thank in particular David