Mr. Dalio, the founder of Bridgewater, said investors had been left in a state of trauma, shock or fear by the shock in global markets this week. "It has had a huge impact on the psychology and attitude of investors towards the reliability of the U.S.," he said in an interview. "It could have been handled better." In his view, the weakness of the dollar and the movement of 30-year Treasuries relative to 10-year Treasuries are worth watching to see if investors start shedding what has long been seen as the safest asset in the world. "Actually, my biggest concern is the underlying supply and demand of bonds," he said.