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What could cause a stock to trade below book value?
The key to evaluating book value is return on equity (ROE). That's net profit divided by book value.  The "value" of book value is measured by the company's ROE (the higher the better). If the stock is selling below book value, the company's assets aren't earning enough to satisfy most investors. Would you buy a CD that was paying, say two percentage points below the going rate for 100 cents on the dollar? Probably not. You might be willing to buy it only by paying 2% less per year, say 98 cents on the dollar for a one year CD. The two cent discount from "book value" is your compensation for a low "interest" rate.