The multilevel analysis - comparative, European, international - provides a comprehensive overview of the accountability of FRSAs and permits a comparison among different levels of regulation. The study sheds clear light on the impact of the FRSAs' accountability on the soundness of financial markets, the protection of investors, the stability of the financial system, and democratic control and justice. It also assesses whether and how post-financial crisis reforms have addressed the accountability shortcomings of the pre-crisis setting. For all of these reasons, it will be warmly welcomed by lawyers, academics, and policymakers working in financial services and related fields.