In the past two years, the world has experienced how unsound economic practices can disrupt global economic and social order. Today’s volatile global financial situation highlights the importance of managing risk and the consequences of poor decision making. The Doom Loop in the Financial Sector reveals an underlying paradox of risk management: the better we become at assessing risks, the more we feel comfortable taking them. Using the current financial crisis as a case study, renowned risk expert William Leiss engages with the new concept of “black hole risk” — risk so great that estimating the potential downsides is impossible. His risk-centred analysis of the lead-up to the crisis reveals the practices that brought it about and how it became common practice to use limited risk assessments as a justification to gamble huge sums of money on unsound economic policies. In order to limit future catastrophes, Leiss recommends international cooperation to manage black hole risks. He believes that, failing this, humanity could be susceptible to a dangerous nexus of global disasters that would threaten human civilization as we know it.