Coffee Perks Up, With Traders Looking Ahead By Alexandra Wexler The Wall Street Journal September 10, 2012 NEW YORK—Arabica coffee futures rallied to a five-week high Monday as investors closed out bets that prices would fall and market participants begin to look ahead to next season's crop. Brazil, the source of one-third of the world's coffee, is nearing the end of the harvest of what is expected to be a record crop of arabica. The estimated production of 50.48 million 60-kilogram (132-pound) bags of coffee beans had encouraged investors to bet that prices would fall. For the week ended Sept. 4, the managed money net-short position was 18,591 contracts, the largest net-short position since May 2007, Commerzbank said in a note. But that report, released Friday after the market closed, spooked investors into closing some of those positions, sparking Monday's rally. Arabica coffee for September delivery on the ICE Futures U.S. exchange surge...