Why do crises occur so frequently when we can prevent them and understand why they occur?
One of my favourite exam questions is: "Given our extensive knowledge about the causes of financial crises and the measures needed to prevent them, why do they happen so frequently?"
We have had a deep understanding of financial crises for over 200 years. A 19th-century central banker dealing with the severe crisis of 1866 would find few surprises in the more recent ones.
All crises share the same fundamental causes. Excessive leverage renders financial institutions vulnerable to even small shocks. Self-preservation in times of stress drives market participants to prefer the most liquid assets. System opacity, complexity, and asymmetric information make market participants mistrust one another. These three fundamental vulnerabilities have been behind almost every financial crisis in...