Public trust and dissatisfaction: digital platforms and public responses to Portugal's vehicle circulation tax debate Available to Purchase

Rui Bruno Santos is a PhD candidate in communication sciences at the University Institute of Lisbon (ISCTE-IUL), researching the topic “Communication in the prevention of tax non-compliance.” He holds a master's degree in management (2012) and a bachelor's degree in marketing and communication (2010) from the University of Atlântica. His research focuses on how communication shapes social norms around taxation and on the relationship between tax compliance and citizens' responses to fiscal policy in digital contexts. Since 2023, Rui has been developing innovative methods for analyzing data on social media platforms by combining R, Python, and advanced content analytics tools. In the same year, he joined the Portuguese team in the European Commission project “Strengthening Tax Compliance by Implementing Behavioural Insights for Revenue Administrations in Member States.”

Claudia Alvares is an Associate Professor in the Department of Sociology at Iscte – University Institute of Lisbon, specializing in Communication and Media Studies. She holds a Ph.D. in Media and Communication Studies (2001) and an M.A. in Journalism (1996) from Goldsmith's College, University of London. Over recent years, Cláudia has served as Principal Investigator in four research projects and participated in four international consortium projects. She is a member of the European Science Foundation College of Experts and has been an evaluator since 2014 for the European Research Council, COST Actions, the British Academy, FCT, and A3ES. From 2012 to 2016, she was President of the European Communication Research and Education Association (ECREA) and has been an editor for prominent academic publications, including the Routledge Studies in European Communication Research and Education series. Her key publications include Media in Europe: New Questions for Research and Policy (2014) and Gendered Transformations: Theory and Practices on Gender and Media (2010). Her peer-reviewed articles have appeared in leading journals such as Media, Culture and Society, Journalism Practice, Feminist Media Studies, and European Journal of Communication. Her research focuses on media policies, cultural transformations, and gender issues within a global context.

Helena Carvalho has a PhD in Sociology, in Theory and Method. Full Professor in the Department of Social Research Methods at ISCTE-University Institute of Lisbon. Director of the Postgraduate in Data Analysis in Social Sciences. Expert in methodological issues and quantitative data analysis. Senior researcher at the Center for the Research and Study of Sociology (CIES-ISCTE-IUL). Area of research is focused inside the quantitative and multivariate methods for categorical and quantitative variables, mainly methods of interdependence and dependence; multilevel models; longitudinal models; measurement models, mediation and moderation models; estimation with bootstrapping. She teaches several courses of multivariate statistics and advanced data analyses on Master and PhD Programs. She has coordinated research projects and she has participated in several research national and international projects, developing her skills of advanced data analysis with quantitative methods. She has published several books and several articles in Portugal and abroad.