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Can PE ratio of stocks be compared to other investments?
Yes, there are non-stock analogs to the Price/Earnings ratio. Rental properties have a Price/Rent ratio, which is analogous to stocks' Price/Revenue ratio.  With rental properties, the "Cap Rate" is analogous to the inverse of the Price/Earnings ratio of a company that has no long-term debt. Bonds have an interest rate.  Depending on whether you care about current dividends or potential income, the interest rate is analogous to either a stock's dividend rate or the inverse of the Price/Earnings ratio.