Started on Wall Street in 1964. Family has been in the stock business since 1873.
"If you have a downturn, I think it becomes a social and political question," the head of Bridgewater Associates says.
Bridgewater Associates founder Ray Dalio says you can't spend bitcoin "very easily."
"I don't see anything that would cause a downturn right now" except tighter monetary policy, the billionaire says.