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SONIA: Thoughts on flattening of Greens/Blues/Golds yesterday

SHORT-STERLING
  • Yesterday morning we wrote about how SONIA calendar spreads were seeing much bigger moves at the front end than further out the curve, and hence the terminal rate was not picking up as much as the moves seen in Whites/Reds would suggest.
  • Below we chart the SONIA strip at key recent days. Looking back to just after the August MPC meeting, the strip was a fairly gentle upward sloping curve which was fairly straight - implying hikes fairly evenly spread over the next five or so years, and still upward sloping at the end of that period.
  • Hawkish events since then (Sep MPC meeting, Pill TSC questionnaire, Saunders weekend comments) have increasingly caused a steeper front-end of the strip and some marginal flattening further out.
  • However yesterday there was a significant development as we saw Greens/Blues/Golds rally but only limited movements in Whites/Reds. This has led to a noticable flattening and even some inversion of the curve from Sep23 for a couple of years.
  • So why have we seen this flattening? This could possibly have been brought on by yesterday's slightly disappointing GDP data. The MPC seems very focused on keeping inflation expectations under control (and also to a lesser extent seems to want to get on with ending APF reinvestments). However, the medium-term outlook for growth is looking increasingly uncertain - not enough to stop the Bank hiking over the next year or so, but enough for a more substantial pause as Bank Rate reaches 1.00%.
  • Recall that 1.00% is the rate at which the MPC will start to consider active gilt sales. If we go back a few months, there had been lots of talk of the Bank's terminal rate being around 1.00% before APF sales commenced, and then to let APF sales do some of the tightening as the Bank waited to see the impact of both gilt sales and the previous rate hikes. This could be something coming back into market participants' thoughts.

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