Bank of America (NYSE:BAC), Citigroup (NYSE:C), and AIG (NYSE:AIG) have all crushed the market over the past year or so, but all three still trade below book value. What causes a stock to trade below book value? In this segment from The Motley Fool's everything-financials show, Where the Money Is, banking analysts David Hanson and Matt Koppenheffer take a question from their mailbag about this issue and tell viewers which of these three stocks they like the best.