For more about these ideas, why not buy my new book?
Comments have been closed for this article.
Tim Harford is an author, columnist for the Financial Times and presenter of Radio 4's "More or Less".
Learn More ›
Enter your email address to receive notifications of new articles by email (you can unsubscribe at any time).
Join 163,155 other subscribers
Copyright © 1999-2018 Tim Harford. All rights reserved.
Articles Archive • Photos by Fran Monks