The problem with using the debt to equity ratio as an identifier is that the economics of companies with a durable competitive advantage are so great that they don’t need a large amount of equity/retained earnings on their balance sheets to get the job done; in some cases they don’t need any. Because of their great earning power they will often spend their built-up equity/retained earnings on buying back their stock, which decreases their equity/retained earnings base. That in turn increases their debt to equity ratio, often to the point that their debt to equity ratio looks like that of a
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