Primark arrives in the U.S. with prices that make H&M look expensive. Price is by far the biggest reason Primark is the undisputed victor in Britain’s cheap-fashion war. Secondary are its up-to-the-minute designs, jazzy stores, and tireless promotion on social media. Primark doesn’t sell online and barely advertises. Instead, customers advertise it for free, posting thousands of selfies with their latest outfits, using the #Primania hashtag to be rated and critiqued. The best images get cycled onto giant in-store LED screens to spur impulse buying. Read more at Bloomberg.