Alan Greenspan says negative rates will spread to US; Hat-tips Gold

"You're seeing it pretty much throughout the world. It's only a matter of time before it's more in the United States," Greenspan told CNBC's "Squawk on the Street" on Wednesday, adding investors should watch the 30-year Treasury yield.

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He added that gold prices have been surging recently because people are looking for "hard" assets they know are going to have value down the road as the population ages. Gold futures are up more than 21% in 2019 and are trading around levels not seen since 2013.