Book excerpt: The findings of this book are based on legal aspects of the majority of the world jurisdictions, and the majority of the existing and new introduced practices to the world stock markets including the role of international commissions, and organizations in this regards. Examination of the stock market efficiency and stability presented in the sixth and seventh chapters is built on empirical investigations, opinions surveys of stock markets experts, and state of arts of the related empirical studies, official reports, and suggested recommendations and best practices. Finally, this book is an attempt to help prevent the next stock market crisis, or to understand how to deal with, in order to shorten the period of declining, shorting the period of recovering, and to reduce the effect of irrational trading during unstable trading.