Monday Market Minute | Aug 28, 2023

Inflation spikes to 4.0% on base effects but the underlying trend remains disinflationary

What Moved

StatsCan reported July CPI at 4.0%, a notable increase from June's 2.8% and the sharpest monthly acceleration of the year. The spike was driven primarily by gasoline base effects — fuel prices had fallen sharply in July 2022, creating an unfavourable year-over-year comparison. Excluding gasoline, the underlying trend remained consistent with gradual disinflation. Core measures edged modestly higher but stayed within the range the BoC had observed for several months. Bond markets sold off initially before stabilizing.

Why It Matters

The inflation print tested market conviction in the rate plateau thesis. For private markets investors, the key question was whether the BoC would interpret the spike as noise or signal. A data-dependent central bank facing a temporary base-effect distortion was expected to look through it, and Governor Macklem's subsequent commentary confirmed that interpretation. The episode highlighted the importance of understanding inflation mechanics — headline CPI could be misleading, and investment decisions based on single data points rather than trends were likely to prove costly.

Signal to Watch

September's CPI reading would be critical for settling the debate. A return to the 3% range would confirm that the July spike was transitory and cement expectations for an extended hold at 5.00%.

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