What’s in a brand? Resiliency for one thing. That’s one of the key takeaways from Interbrand Design Forum’s annual ranking of the 50 most valuable U.S. retail brands. The study is based on the idea that retail brands have a financial net worth that can be measured through three metrics: the brand’s financial performance; the role the brand plays in driving consumer selection; and brand strength, or the ability of the brand to secure the delivery of expected future earnings.