My only reasons for writing a preface to a work so exhaustive, and in itself so lucid, as Professor Böhm-Bawerk’s
Kapital und Kapitalzins, are that I think it may be advisable to put the problem with which it deals in a way more familiar to English readers, and to show that the various theories stated and criticised in it are based on interpretations implicitly given by practical men to common phenomena…. [From the Translator’s Preface, by William A. Smart.]