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The best time to rob a bank is in the morning, according to Stephen Dubner, co-author of Freakonomics and new book When to Rob a Bank. He added, however, that "the return on investment generally on bank robbing is among the worst in crime". On the publication of multi-million selling pop-economics book Freakonomics ten years ago, the authors, Steven Levitt and Stephen Dubner, set up a blog to explore the stranger aspects of our economic behaviour. Now, 8,000 blog posts on, they've released a book of the best, pondering the rate of return of bank robbery and the possibility of a sex tax, among the multitude of topics.