Don't rely on just one metric to inform your investing decisions.Buying a stock at a discount can potentially set up investors for significant gains in the future. And one way to find undervalued stocks is by looking at their price-to-book ratios. If a stock is trading at or below its book value -- its total assets minus its liabilities -- that can mean that there's good value there for investors. But that's not always the case.A business's assets may be overvalued and thus, the book value may not be all th ...