Editor’s note

An earlier version of this story said Amazon raised prices in October by a higher percentage than Walmart and Target. The Post based that information on an analysis from data analytics company Profitero, which tracks prices across retailer websites, and an interview with the company’s president. Two days after publication and after Amazon raised objections, Profitero reached out to The Post to say it should not have made the comparison because the differences were not statistically significant. (It still says that the e-commerce giant has raised prices lately on the basket of products it tracks.) This story has been changed to remove the price comparisons with other retailers.

The Post has made other changes to the story since publication. A secondary headline had suggested that other retailers are raising prices in response to Amazon’s own price increases. Analysts have generally documented over time that the e-commerce giant influences prices across the Web. But there isn’t specific evidence Amazon’s recent price increases have led rivals to also boost prices. This story has also been updated to clarify that some items on Amazon that are higher priced than on rival sites are sold by third parties, not directly by Amazon.

SEATTLE — As the holiday shopping season kicks off this weekend, consumers will find prices higher than they’ve been in months.

That is even true at Amazon, the e-commerce giant that says its algorithms meet or beat competitors’ pricing, according to Profitero, a data analytics company. Profitero tracks 20,000 of the company’s most popular items — and identified 1,600 products that were among the most popular in October 2020 and October 2021. The price of those products had increased an average of 7.5 percent over that time.

The price increases are significant because Amazon — the dominant online retailer with more than 41 percent of e-commerce, according to eMarketer — influences prices across the Web, according to analysts and economists. Amazon’s algorithms scrape online price tags across its rivals to match or beat the lowest prices.

Because most prices are now available online, rivals like Walmart and Target can also scan and match or beat prices, something that has resulted in more uniform pricing across the board. The trend, dubbed the “Amazon Effect” by economists, generally results in downward pricing pressure.

Shifts in pandemic shopping habits meant thinner Black Friday crowds in stores on Nov. 26. (Reuters)

But it also means eased competitive pressure if prices on Amazon go up, Harvard Business School economist Albert Cavallo said, resulting in higher prices across the board. And that translates to stores now too as retailers with brick-and-mortar stores are matching their online pricing to physical shelves.

“Online competition is a force for price uniformity, and therefore also inflation equalization,” Cavallo said. And as retailers get better at bringing online pricing, with its frequent swings, to their physical stores, the Amazon Effect becomes an even greater force.

That matters because consumer prices grew 6.2 percent in October compared to a year ago, according to the Bureau of Labor Statistics. The spike, the largest annual inflation increase in 30 years, is driven by soaring energy prices and ongoing supply-chain backlogs.

Retailers — including Amazon — are struggling with the global supply-chain crunch and a domestic labor shortage that have pushed up costs. Amazon said last month it plans to spend an extra $4 billion during the fourth quarter to lure seasonal workers with richer paychecks and benefits and to ensure that packages arrive at its warehouses. The company is hiring 150,000 seasonal workers. In the third quarter, the company spent $18.5 billion on fulfillment costs.

“We’re doing everything we can,” finance chief Brian Olsavsky said on a call last month with analysts. “The issue is, it’s costly.”

(Amazon founder Jeff Bezos owns The Washington Post.)

Amazon spokesman Patrick Graham acknowledged the pressure that increased manufacturing and supply-chain costs puts on pricing.

“Customers come to Amazon to find low prices, and we strive to deliver by matching the lowest price from across relevant competitors every day,” Graham said. “In spite of increased manufacturing and supply-chain costs, Amazon continues to offer customers the best possible value and selection, not only during the holiday season but throughout the year.”

Amazon has long used algorithms that scrape other retail websites to ensure its merchandise matches or beats the competition. But consumers don’t always find the best prices on its site because it’s a marketplace. An 18-roll package of Charmin Ultra Strong, for example, was recently available on Amazon for $31.03, while Target offered the product for $18.79.

Amazon’s Graham said the Charmin toilet paper on its site was sold by a third-party merchant who sets its own prices on Amazon’s site. Amazon signals when products are being sold by third parties with a small label, although consumers seldom notice the difference.

“Amazon seeks to always meet or beat the best price offered at other retailers on the products we sell ourselves, and our systems continually benchmark prices in other stores to make sure we are delivering on this promise,” Graham said after publication of this article. “If we find an isolated error where we offer a product at a higher price than other major retailers, we quickly investigate and take action to ensure our price meets or beats the lowest price elsewhere.”

The majority of products offered through Amazon’s marketplace come from third-party sellers, and Amazon pressures them to keep prices competitive. D.C. Attorney General Karl A. Racine filed an antitrust suit in May alleging that Amazon prevents sellers from offering their products at lower prices or on better terms on any other online platforms, including their own websites, and that prohibition results in “artificially high” prices across e-commerce sales. Amazon has said that sellers are responsible for the prices they offer on its marketplace.

One way Amazon keeps prices from third-party sellers low is through the “buy box” — the crucial piece of digital real estate on product pages that customers use to add items to their shopping carts. The buy box is often a boon for sellers, since studies have shown that shoppers regularly purchase items Amazon’s algorithms elevate there.

There’s also plenty of competition. Product categories like ear buds with several third-party sellers fighting one another for sales are less prone to inflationary pressure, said Juozas Kaziukenas, CEO of the e-commerce research firm Marketplace Pulse.

“The marketplace protects against rising prices because it dynamically shifts sales to the most competitive offers,” Kaziukenas said. “On Amazon, it matters less if products X and Z are getting more expensive. Because on Amazon there are also Y, T, U, etcetera products that didn’t get more expensive. Consumers will pick those.”

Amazon’s prices rose in part because it started with lower prices, Profitero President Sarah Hofstetter said. Even with the price increases on Amazon, Profitero found that Walmart’s prices on the 20,000 items are 4 percent more than Amazon’s prices, and Target’s prices are 15 percent more expensive.

Target and Walmart did not immediately respond to a request for comment.

Across the board, however, prices are higher on some of those items. Take the Bose portable home speaker, an item that sold for $399 on Amazon, Walmart and Target sites last weekend. Profitero found that the average price for the speaker from July to October this year jumped 9 percent on Amazon compared to the same period a year ago. The price on the device jumped 3 percent at Target and 2.8 percent at Walmart.

Meanwhile, large consumer-goods companies are struggling to fill the orders placed by Amazon and other retailers — leading to price spikes in categories such as grocery and pet products.

CommerceIQ, a consultant for consumer-product brands including Johnson & Johnson, Kellogg’s and Nestle, tracks the orders Amazon places for items from its 4,000 clients to sell on its site. CommerceIQ said those clients’ ability to meet orders has dipped since spring.

Amazon is “ordering more, but vendors are less able to fill them,” said Guru Hariharan, CommerceIQ’s chief executive.