As the case explains, at one time customers were likely to buy their donuts at Dunkin’ Donuts and their coffee at Starbucks. However, several years ago Dunkin’ Donuts added espresso drinks to its menu. If Dunkin’ Donuts adopted this strategy in order to get its donut customers to spend their coffee dollars at Dunkin’ Donuts instead of at Starbucks, what type of growth strategy does this change represent?