Problem: Why do we need theories to explain the complex, chaotic world? What are the differences between the neo-realist and liberal theories of world politics? What are the core concepts and propositions of each theory (for example, anarchy, self-help, balance of power, comparative advantage, democratic peace theory, collective security, etc.)? How does each theory explain the conditions of war and peace in the world? How do they understand "security" differently? In your view, which of these theories better captures the fundamental drivers of peace and conflict in the world?