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NZ-US 10Y Differential Too Wide

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The NZ-US 10-year yield differential currently stands at +36 bps, up from its late July low of +14 bps, which was the narrowest level since late 2022. Prior to this, the differential had fluctuated between +20 and +80 bps since late 2022.

  • The recent widening of the 10-year yield differential aligns with an increase in the NZ-US 3-month swap rate 1-year forward (1Y3M) spread.
  • However, a simple regression analysis over the current tightening cycle suggests that the 10-year yield differential is about 10 bps wider than fair value, which would be +26 bps instead of the current +36 bps.
  • It's important to note that the regression error was approximately +20 bps in mid-August, indicating some variability in the relationship.
  • The 1Y3M differential is a proxy for the expected relative policy path over the next 12 months.


Figure 1: NZ-US Cash 10-Year Yield Differential (%) Vs. Regression Fair Value (%)



Source: MNI – Market News / Bloomberg

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