 Complete the following phrase:  The theme of the book is that the world ficial system is vulnerable to singularitiesdisasters arising out of apparently trivial details, as implied by chaos theory and its Butterfly effect. He discusses the critical and often underappreciated role of liquidity in the markets and presents a theory of normal accidents arising from the combination of tight coupling and complexity. Bookstaber reviews accidents such as Three Mile Island, ValueJet, and 