Instruct: Classify Amazon reviews into positive or negative sentiment
Query: essential

Mr. Partnoy has done America an enormous service in writing this book. It is essential reading for anyone who wishes to understand the origins of the current financial crisis, and the policies that need to be put forward to prevent a recurring breakdown of our economy at the hands of irresponsible and greedy financial sharks.He is a wonderful writer and his style is extremely accessible. Do not be intimidated. He makes an irrefutable case from his experience as an insider about the dangers of allowing an unregulated, over-the-counter derivatives market to grow like a cancer in the dark. Read it. It's time to get angry.