By Martin Langfield
The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
It is said that the philosopher Diogenes the Cynic roamed ancient Athens with a lamp in daylight to search for an honest man. Dan Ariely, a professor of psychology and behavioral economics, uses more modern research techniques for a similar quest. He reports his findings in a new book, “The (Honest) Truth About Dishonesty.”