September 7, 1946 Professor Corvin D. Edwards The College of Liberal Arts Northwestern University Evanston, Illinois Dear Professor Edwards: Thank you very much for your letter of August 1. In my systematic treátise "Nationaloekonomie", published in 1940 in Geneva, Switzerland, I deal with all kinds and varieties of interventionis. A revised English=language edition of this book which I am preparing will be published by the Yale Univerity Press in 1947. I hope that you will find your questions answered satisfactorily in the chapters of my book. Cordially yours