Edwin Mansfield was a research pioneer into the economics of R and D and technological change. As appreciation and remembrance for his scholarly contributions, eminent scholars have contributed original papers for this edited volume. The authors have followed the "e;Mansfieldian"e; approach of emphasizing economic insight and intuition over mathematical rigor and as a result are very accessable. Essays in Honor of Edwin Mansfield has the potential to serve as a reader in all advanced undergraduate and graduate classes/seminars in the economics of R and D and technological change. This edited volume will be the definitive work in the field.