This book constitutes the refereed proceedings of the 18th International Conference on Economics of Grids, Clouds, Systems, and Services, GECON 2021, in September 2021. Due to COVID-19 pandemic the conference was held virtually hosted by the Libera Universita Maria SS. Assunta (LUMSA), Rome, Italy. The 7 full papers and 2 short papers presented in this book were carefully reviewed and selected from 41 submissions. In addition, this book includes 8 work-in-progress papers and 2 extended abstracts. Chapters "AI Technologies and Motives for AI Adoption by Countries and Firms: A Systematic Literature Review"; "Knowledge Management Framework for Cloud Federation"; "Architecture for Orchestrating Containers in Cloud" and "Towards Software Compliance Specification and Enforcement using TOSCA" are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.

This book constitutes the refereed proceedings of the 17th International Conference on Economics of Grids, Clouds, Systems, and Services, GECON 2020, held in Izola, Slovenia, in September 2020. Due to COVID-19 pandemic the conference was held virtually by the University of Ljubljana. The 11 full papers and 9 short papers presented in this book were carefully reviewed and selected from 40 submissions. The papers are structured in selected topics, namely: Smartness in Distributed Systems; Decentralizing Clouds to Deliver Intelligence at the Edge; Digital Infrastructures for Pandemic Response and Countermeasures; Dependability and Sustainability; Economic Computing and Storage; Poster Session.