
It will not be long before the spread of negative interest rates reaches the U.S., former Federal Reserve Chairman Alan Greenspan said.
“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.

There are currently more than $16 trillion in negative-yielding debt instruments around the world as central banks try to ease monetary conditions to sustain the global economy. The 10-year sovereign bonds in Belgium, Germany, France and Japan — among others — are trading with a negative rate.

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“We’re so used to the idea that we don’t have negative
interest rates, but if you get a significant change in the attitude of the population, they look for coupon,” Greenspan said. “As a result of that, there’s a tendency to disregard the fact that that has an effect in the net interest rate that they receive.”

Greenspan’s comments come after New York Fed President John Williams called low inflation the “problem of this era” in a speech earlier in the day.