"What does reflect reality very well is complexity theory, which comes from physics. I'm the one pioneering the idea of bringing it to capital markets. When you look at capital markets through the lens of complexity theory, you ask "what's the scale of the system?" Scale is a fancy word for size. What measures are you using? If you look at total debt, the concentration of assets in the five largest banks, what percentage of the total assets of the five largest banks are interconnected? What you see is a very densely connected, fragile system that could collapse at any moment."