The New Zealand dollar fell as Federal Reserve officials talked up the prospect of an interest rate hike this year which would sap the kiwi's relative interest rate advantage, and ahead of a speech by Reserve Bank governor Graeme Wheeler.
The kiwi declined to 72.16 US cents at 5pm in Wellington from 72.42 cents at 8am and 72.68 cents on Friday in New York. The trade-weighted index dropped to 76.64 from 77.05.
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The US dollar index extended its gain during the Asian trading session as investors latched on to comments by San Francisco Federal Reserve President John Williams, a non-voting Fed member, who said that the US economy had "good momentum" and it made sense to return to gradual increases, "preferably sooner rather than later." New Zealand's currency has been bolstered by an extended period of near-zero US interest rates, and a hike by the Fed would do some of the RBNZ's work for it. Fed chair Janet Yellen is scheduled to talk at the Jackson Hole symposium next weekend, where she may give a clearer steer on the timing of rate hikes.