This book is for anyone interested in understanding the failure of the economic policies which are today destroying the U.S. economy and most of the world economies. The credit crunch today is not destroying capital but recognising that capital was destroyed by misallocation in the years of irrational exuberance. If that is so, then we are entering a spiral of debt deflation that will play out slowly for years to come. To understand how that works, we turn to Professor Irving Fisher of Yale and this book of his.