Real effective exchange rates are calculated as weighted averages of bilateral exchange rates adjusted by relative consumer prices.
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Release: BIS Effective Exchange Rate Indices
Bank for International Settlements, Real Narrow Effective Exchange Rate for New Zealand© [RNNZBIS], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/RNNZBIS/, August 28, 2015.