If the financial system has a defect, it is that it reflects and magnifies what we human beings are like. Money amplifies our tendency to overreact, to swing from exuberance when things are going well to deep depression when they go wrong. Booms and busts are products, at root, of our emotional volatility.
The Ascent of Money: A Financial History of the World (ed. Penguin UK, 2016) - ISBN: 9780141900315