brand-as-business bit:  The power of distinctive brand positionings jumped off the page of a recent BusinessWeek write-up about Costco getting sued by Tiffany & Co. for selling “Tiffany” diamond engagement rings. The article suggested Costco customers are pragmatic and deal-driven (“People who can spend [$40,000] on a piece of jewelry aren’t usually the sort to accessorize at Costco.  Yet […]