The first edition of this book appeared in 1946. Eight translations were made of it, and there were numerous paperback editions. In a paperback of 1961, a new chapter was added on rent control, which had not been specifically considered in the first edition apart from government price-fixing in general. A few statistics and illustrative references were brought up to date. Otherwise no changes were made until now. The chief reason was that they were not thought necessary. My book was written to emphasize general economic principles, and the penalties of ignoring them-not the harm done by any specific piece.