On this week's Labor Day special, Freakonomics co-author Stephen Dubner talks about his new book, When to Rob a Bank: And 131 More Warped Suggestions and Well-Intended Rants. And Charlie Wheelan shares some insights from his book, Naked Money: A Revealing Look at What It Is and Why It Matters. 

Best Buy surprises. Herbalife slides. Tiffany shines. And a drugmaker faces big blowback. Plus, Charles Duhigg offers some productive insights from his new book, Smarter, Faster, Better: The Secrets of Being Productive in Life and Business. 

Home Depot and Lowe's may have more room to run. Sports retailers have a strong week. The wireless wars heat up. An activist takes on Buffalo Wild Wings, while McDonald's makes a rash decision. We discuss those stories and share three stocks on our radar. Plus, Frank Ahrens shares highlights from his new book Seoul Man: A Memoir of Cars, Culture, Crisis and Unexpected Hilarity Inside a Korean Corporate Titan.

Alibaba flies higher. Disney delivers. Shake Shack stumbles. And Walmart makes a big buy. Plus, journalist Jenny Anderson talks about her book, Spousonomics: Using Economics to Master Love, Marriage, and Dirty Dishes.

Fitbit climbs. TripAdvisor stumbles. Electronic Arts scores. And FireEye gets singed. Plus, Motley Fool retirement expert Robert Brokamp shares the latest and greatest thinking on how much you need to retire.