Bargaining, negotiation and civil penalty sanctions together constitute central techniques used by regulators in securing compliance with the law. This book is a timely exploration of these practices, constructing a principled framework for evaluating their legitimacy and thereby drawing into sharper focus the importance of the constitutional principles in regulatory compliance. Although Australian competition law provides the focal point of the book, its analysis and critique is equally applicable to other competition law regimes and to other areas of business regulation. While there are numerous empirical studies of regulatory enforcement, this book introduces a normative dimension to the debate by seeking to identify whether there are certain principled and ethical limits that inform and circumscribe the limits of legitimate enforcement practice. It is likely to be of interest to scholars in the fields of public law, criminology, economics, and regulation, and may also be of considerable assistance to legal practitioners in providing a principled, legal foundation from which to draw in their dealings with regulators.