In the context of growing public interest in sustainability, Corporate Social Responsibility (CSR) has not brought about the expected improvement in terms of sustainable business. Self-regulation has been unable to provide appropriate answers for unsustainable business frameworks, despite empirical proof that sustainable behaviour is entirely in corporate enlightened self-interest. The lack of success of the soft law approach suggests that hard law regulation may be needed after all. This book discusses these options, alongside the issue of shareholder primacy and its externalities in corporate, social, and natural environment. To escape the "prisoner's dilemma" European corporations and their global counterparts have found themselves in, help is needed in the form of EU hard law to advocate sustainability through mandatory rules. This book argues that the necessity of these laws is based on the first-mover's advantage of such corporate law approach towards sustainable development. In the current EU law environment, where codification of corporate law is sought for, forming and defining a general EU policy could not only help corporations embrace this self-enlightened behaviour but could also build the necessary "EU corporate citizenship" atmosphere. Considering the developments in the field of CSR as attempts to mitigate negative externalities resulting from inappropriate shareholder primacy use, the book is centred around a discussion of the shareholder primacy paradigm, its legal position and its (un)suitability for modern global business. Going beyond solely legal analysis, juxtaposing legal principles and argumentation with economic theoretic approaches and, more importantly, real-life examples, this book is accessible to both professionals and academics working within the fields of business, economics, corporate governance and corporate law.