1 Customer Categorization, Relational Justice and SME Performance in Supermarket Supply Chains Ricardo Malagueno de Santana, Senior Lecturer in Accounting, Norwich Business School, Universitiy of East Anglia, Norwich, UK. Tel: +44 (0)1603 59 1403, Email: R.Malagueno@uea.ac.uk. Ismail Gölgeci, Associate Professor of Marketing Strategy, School of Business and Social Sciences, Department of Business Development and Technology, Aarhus University, Herning, Denmark. Tel: +4593521226, Email: i.golgeci@btech.au.dk. Andrew Fearne, Professor of Value Chain Management, Norwich Business School, Universitiy of East Anglia, Norwich, UK. Tel: +44 (0)1603 59 7239, Email: A.Fearne@uea.ac.uk. Acknowledgements: We would like to thank Lucy Coupe for help with data collection and preparation of the database. This research was made possible by funding from Invest NI and the ESRC Business and Local Government Data Research Centre at the University of East Anglia.