“KitKat bars have been among the best-selling candies in Britain since they were invented here in the 1930s. One of the chocolate-covered wafers is eaten every 47 seconds in the United Kingdom, KitKat says. So it was natural for its maker, Nestle SA, to apply to KitKat a marketing strategy that is becoming increasingly popular at food companies world-wide: extending a popular brand into new flavors and styles… The experiments flopped. In just two years, KitKat’s overall sales in the U.K. dropped 18 percent…”