A decade ago, Stephen J. Dubner and Steven D. Levitt breathed new life into the world of economics with their lively book, Freakonomics. Now they’re back with a new collection of off-center economic questions called When to Rob a Bank: …And 131 More Warped Suggestions and Well-Intended Rants (William Morrow). This hour, we’ll talk to Dubner about the book and the lasting effect of the original Freakonomics.