This IUCN economic brief is based on the dissertation “Economic assessment of a deposit refund system, an instrument for the implementation of a circular economy solution to reduce plastic waste in Menorca, Spain”, developed in fulfilment of International Master of Science in Sustainable and Innovative Natural Resource Management (SINReM) organized by Ghent University, Uppsala University and TU Freiberg (Sanabria, Raes, & Speelman, 2021).