The following question and answer by Sheikh Yusuf Talal DeLorenzo attendees of the Dow Jones University Courses on Islamic Investement.Question:: In the second lesson, there is a reference to Nabil A. Saleh's Unlawful Gain and Legitimate Profit in Islam, London 1992. This is the second edition. Can you tell me whether it is substantially improved from or better than the first edition? I ask because I own a copy of the first edition. Thank you.Answer: The only copy I have is of the second edition and so I am unable to compare. Likewise, there is nothing in the Introduction to indicate any major changes orrevisions. In any case, the book is an extremely informative one and deals with material in ways that easily illustrate difficult and complex concepts. For serious students of Islamic finance, it is an essential work.