Company-Relevant Stakeholders-Based Management System 236 Company Management System Concept 236 Necessity of the Stakeholders-Based Management System 240 Definition of the Company-Relevant Stakeholders-Based Management System 245 Main Differences Between the Company-Relevant Stakeholders-Based Management System and "Classic" Company Management Systems 251 Principles of the Company-Relevant Stakeholders-Based Management System 254 Multiple Advantages of the New System for the Company and Relevant Stakeholders 260 Comparative Approach of the Company-Relevant Stakeholders-Based Management System with the Stakeholders' Engagement 262 Necessity and Benefits of the Company-Relevant Stakeholders-Based Management System in the COVID-19 Pandemic and Post-Pandemic Contexts 264 References 270 10 The Economic, Social, Ecologic, and Psychological Background of the Company-Relevant Stakeholders-Based Management 273