The Greatest Trade Ever, details the events surrounding John Paulson’s 2007 bet against the housing market. The book explains how Paulson, a hedge fund manager, came to be aware of the risky mortgage practices of financial institutions and used credit default swaps (CDS) to profit from the impending housing collapse. The second source provides the book’s introduction, explaining the context of this bet, its significance, and the author’s reasoning for writing about it. The author details the financial crisis of 2007, noting that even seasoned investors like Warren Buffett and George Soros overlooked the risks posed by the growing housing bubble. The author also reveals the book’s intention to explore the reasons behind the failures of those responsible for the crisis and to identify potential lessons to be learned for the future.