Retail sales, Consumer Price Index: What to know this week

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Traders this week will be focused on new data on inflation and spending. Each are likely to have moderated last month after initial reopening surges in demand and price increases earlier this year.

On the inflation front, the Labor Department's August Consumer Price Index (CPI) is set for release on Tuesday. The print is expected to decelerate on both a monthly and annual basis, suggesting the peak growth rates in prices for consumer goods and service may already have passed during this economic recovery.

Consensus economists expect the broadest measure of CPI will grow 0.4% in August compared to July, and by 5.3% compared to August 2020. In July, the headline CPI grew 0.5% month-on-month and by 5.4% year-on-year, with the latter representing the fastest annual growth rate since 2008.

Excluding more volatile food and energy prices, the CPI likely grew 0.3% month-on-month in August to match July's pace. However, on a year-over-year basis, the CPI excluding food and energy prices likely ticked down to a 4.2% rate, or a hair below July's 4.3% rate. That had, in turn, moderated from a 4.5% annual rate in June, which had marked the fastest rise since 1991.

The multi-year highs in consumer price increases so far this year have coincided with the broadening economic recovery, as more Americans became vaccinated and were more inclined to spend. This especially drove up prices in goods and services closely tied to renewed consumer mobility.

Used car and truck prices, for instances, rose at least 7.3% in each of April, May and June before decelerating sharply to an only 0.2% rise in July — suggesting an initial wave of demand was finally being unwound as consumers reacclimatized to going back out and companies' supply chains began to catch up with demand. Similar trends have been seen in prices for airline tickets, motor vehicle insurance and apparel prices, which pulled back in July after spiking earlier in late spring and early summer.

Other categories of consumer prices have seen more sustained increases, especially in food and energy prices. Other services-related areas of consumption have also seen sustained rises, with consumers returning to in-person activities like dining out at bars and restaurants and leisure traveling. The CPI's "services less energy services" category has on a monthly basis in every month so far in 2021 except January, mostly recently at a 0.3% clip.

Muhlenberg, PA - March 18: Redner's Quick Shoppe employee Julie Zezenski and  Manager Pete Ostrowski work behind the counter at the Redner's Quick Shoppe on Tuckerton Road in Muhlenberg township Thursday afternoon March 18, 2021. (Photo by Ben Hasty/MediaNews Group/Reading Eagle via Getty Images)
Muhlenberg, PA - March 18: Redner's Quick Shoppe employee Julie Zezenski and Manager Pete Ostrowski work behind the counter at the Redner's Quick Shoppe on Tuckerton Road in Muhlenberg township Thursday afternoon March 18, 2021. (Photo by Ben Hasty/MediaNews Group/Reading Eagle via Getty Images) · MediaNews Group/Reading Eagle via Getty Images via Getty Images

"Although the rise in global CPI inflation earlier this year was concentrated in energy and a narrow set of goods prices linked to supply constraints, the acceleration in food prices, alongside a recent pickup in services price inflation, sends a signal that pandemic-related pressures on prices are broadening," JPMorgan economists Nora Szentivanyi and Bruce Kasman wrote in a note last week.