March 12, 1949 Doctor Albert Hahn 830 Park Avenue New York 21, N. Y. Dear Doctor Hahn: Thanks for sending me an advance copy of your "Economics of Illusion." I am delighted to see your various essays, published over many years, reprinted and the collection enlarged and enriched by the addition of new articles. The title you gave to the volume is very well chosen. What you are dealing with is the most pernicious illusion of our age, the great fallacy that leads astray all governments and all political parties. There is hardly any more urgent task facing an economist in these days than to debunk all the varieties of the inflationist and "expansionist" doctrines and to unmask the syllogisms and contradictions in the writings of their authors. Your new book is a very valuable contribution to this end. I congratulate you heartily and I hope that the volume will also be reed by those whose power of judgment is dimmed by Gesellianism and Keynesianism. With all good wishes Cordially yours