WASHINGTON, Oct. 14 (Xinhua) -- Bridgewater, the world's largest hedge fund, warned on Sunday that the U.S. economy faces a looming deceleration as tighter monetary policy starts to weigh on growth and ratchets up pressure on financial markets. In an interview with Financial Times, Bob Prince, co-chief investment officer at Bridgewater, said the recent market turmoil was triggered by investors realizing that this year's strong economic growth and robust corporate earnings were "likely peaking." "A lot of optimism about future earnings growth has been baked into equity valuations.