November 10, 2026

The CPI  rose 0.4% in October after climbing 0.6% in September and 0.4% in August.  The year-over-year increase is now 3.9%.  We expect the overall CPI to increase 3.6% in 2026 as the war with Iran has boosted oil prices.  Looking ahead we expect the CPI to increase 2.3% in 2027 for a variety of reasons.  See below.

Food prices rose 0.4% in October after having been unchanged in September.  In the past year food prices have risen 2.8%.  Economists typically subtract food and energy prices from the CPI and focus on the so-called “core” rate of inflation.  That is because these two categories are extremely volatile.  They might go up for a few months but then reverse direction and decline almost as quickly as they rose.

Energy prices rose 0.7% in October after having jumped 5.2% in September after having climbed 2.1% in August.   In the past year energy prices have risen 20.4%.

The core CPI rose 0.3% in August, September and October.  The  year-over-year increase stands at 2.8%.  We expect the core CPI to increase 2.9% in 2026 and then slow to 2.3% in 2027.

At the moment, goods sector inflation has increased slightly  in the past year as consumers have been spending less money on goods but more on services. Core goods sector inflation has risen 0.8% in the past year.  However, inflation in the core service sector (which is twice the size of the goods sector) has been steadily rising and has climbed 3.3% in the past year.  This is important because services make up two-thirds of the entire CPI.

.The shelter component of the CPI rose 0.3% in October after climbing 0.4% in September after rising 0.3% in August.   The year-over-year increase now stands at 3.4%. This is a big deal because rents represent one-third of the entire CPI index.

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This is because there is a good correlation between the shelter component of the CPI and what happened to the Case Shiller index of home prices with a lag of about 15 months. This means that the shelter component should slow from 3.4% today to 2.4% in 2027..

Typically, M-2 rises at about a 6.0% pace.  But when the Fed purchased $4.0 trillion of government securities back in the spring of 2020, money growth soared.  It continued to grow rapidly right up through March of 2022.  Since then the Fed has been shrinking its portfolio and that has caused the money supply to decline.  Currently, the level of M-2 is almost exactly on its longer-term 6.0% growth path.   That means that the economy has eliminated all of the excess liquidity created in 2020 and 2021.  But in the last six months the money supply has grown at a modest 5.0% pace.  For this reason we should not expect a repeat of the dramatic increase in inflation that we saw in 2020 and 2021.  If slow money growth continues it will eventually move below its longer run trendline. This means that the inflation rate should  shrink towards the desired 2.0% pace once the war ends and oil price declines work their  way through the system.

We expect the core CPI to increase 2.9% in 2026 but slow to 2.3% in 2027..  The core personal consumption expenditures deflator should increase 3.2% in 2026 but slow to 2.5% in 2027. These measures of inflation are being boosted somewhat as higher oil prices work their way through the economy.  Oil is a major input into the production of plastics, rubber, synthetic materials such as nylon, household cleaners and beauty products. This is the inflation measure the Fed would like to increase by 2.0%.

Given all of the above we expect the overall CPI to increase 3.6% in 2026 and 2.3% in 2027.  We expect the core CPI to climb  2.9% in 2026 and 2.3% in 2027.

Stephen Slifer

NumberNomics

Charleston, SC