The article argues that after the economic crisis of 2008-2010, there is a need for new economic ideas beyond the traditional neoclassical theory. The focus is shifting towards creating models that show how economic forces interact and maintain balance in the system. The authors propose a "Symmetrical model" of general economic equilibrium to understand how economic feedback mechanisms work. They show that without a proper analysis of economic categories and flows, extreme income inequality can disrupt the balance of the economic system. The articles in the book provide a new perspective on how a market economy functions, starting from methodology and ending with a mathematical model of economic equilibrium.