While contractual relationships between private parties in the financial services field were traditionally the exclusive domain of private law, in particular contract law, the early twenty-first century has witnessed the rise of contract-related public regulation in this area both at EU and Member State levels. This development has received a new impulse in the wake of the recent financial crisis with the growing importance of public supervision over contractual relationships and the ex ante supervision rules for the protection of specific categories of weaker parties. The increasing presence of contract-related regulatory rules next to traditional contract law gives rise to a complex issue of the relationship between the two and its implic...