1 Education, inequality and use of digital collaborative platforms: The European case Online Appendices Jesús M. Artero Cristina Borra Rosario Gómez-Alvarez The Economic and Labour Relations Review 31(3) September 2020 Appendix A. Main studies on the relationship between DCPs and education Appendix B Model and main impacts Table B.1 Construction of the variables in the model Table B2 Descriptive statistics of the main dependent, independent variables and controls in the model Table B.3 Robustness checks by openings at age 25 and public/private university. Table B.4 Main estimated impact of being a college graduate on use of DCPs. Appendix C Instrument validity