Gold heading toward a new all-time high, says Citi

Gold bars sit in a vault at the Perth Mint Refinery, operated by Gold Corp, in Perth, Australia, on August 9, 2018.
Carla Gottgens | Bloomberg | Getty Images

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It's "only a matter of time" before gold rises to a new all-time high, according to Citi, as supportive factors including loose monetary policy and low real yields continue to drive prices higher.