PREFACE 序 THIS book is chiefly addressed to my fellow economists.I hope that it will be intelligible to others.But its main purpose is to deal with difficult questions of theory,and only in the second place with the applications of this theory to practice,For if orthodox economics is at fault,the error is to be found not in the superstructure,which has been erected with great care for logical consistency,but in a lack of clearness and of generality in the premisses.Thus I cannot achieve my,object of persuading economists to re-examine critically certain of their basic assumptions except by a highly abstract argument and also by much controversy.I wish there could have been less of the latter.But I have thought it important,not only to explain my own point of view,but also to show in what …