Current and future issues in the global accounting/consulting, business opportunity, and credit rating agency (CRA) industries can have significant multiplier-effects on international trade, sustainable growth, and compliance (as physical phenomena). These three industries are among the most international and human-capital-intensive of all service industries. In these industries, analysis of business models and industry dynamics can provide insights about how human-computer interaction (HCI) and contract theory affect the evolution of financial market ecosystems and cross-border information flows, and how business models, work-allocation mechanisms, and liability allocation can evolve to manage change. An often-overlooked issue is that non-performing loans (NPLs), sustainability, and CRA efficiency can be significantly affected by business processes, corporate strategy, and HCI in industry ecosystems, multinational corporations (MNCs), and economic systems. Complex Systems and Sustainability in the Global Auditing, Consulting, and Credit Rating Agency Industries compares these three industries and introduces theories of public policy and “inter-business” processes. The book links industry structure, complex systems (including networks), behavioral game theory, structural changes, and antitrust problems to sustainability and the efficiency of pollution-remediation systems. The book introduces new “informal algorithms” and business/resource-allocation models that solve social-choice problems, and also contravene “impossibility theorems” that are at the core of modern computer science and mechanism design. This book is essential for professors and masters/PhD-level students and employees (in industry, financial services, research institutes, consulting firms, and government agencies) who are interested in industrial mathematics and theoretical computer science.