Within this world, the Apple Store is the undisputed king, a retail phenomenon renowned for impeccable design, deft service and spectacular revenues. Last year, the company’s 327 global stores took in more money per square foot than any other United States retailer — wireless or otherwise — and almost double that of Tiffany, which was No. 2 on the list, according to the research firm RetailSails.
Worldwide, its stores sold $16 billion in merchandise.