A new study from Asymco analyst Horace Dediu finds that Apple is continuing to outpace the rest of the retail industry in sales per customer, sales per store and sales per square foot -- more than double the income of the second-place finisher Tiffany & Co and three times the third-place entry, Lululemon Athletica. In addition to retaining the crown of retailers, Dediu found revenues had increased from a year ago.
