By Frank Jack Daniel Reuters September 7, 2007 Starbucks Chairman Howard Schultz on Friday predicted a shortage of gourmet coffee beans as coffee drinkers across the globe develop more sophisticated tastes. Whilst its competitors will struggle of find the gourmet beans they need, a decade of buying from top end coffee growers means the global coffee chain has ample supplies for the future, the Starbucks founder told Reuters in an interview. "At the very top of the market where Starbucks plays, I do not believe that others will have access to the quality of coffee that we are buying because we have secured those sources," Schultz said. Speaking on a trip to Mexico City to mark five years since opening the first store here, Schultz said Starbucks buyers traveled 300 days a year nurturing contacts with farmers, finding new growing regions and training suppliers to produce better coffee. "At certain points in the future, the work that we have done over the last ten years to ...