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Early deliveries can lower product ratings by 0.2 stars, analysis of 11 million reviews finds

Phys · · 462 words · By University
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What to know about Early deliveries can lower product ratings by 0.2 stars, analysis of 11 million reviews finds

A study published in Production and Operations Management analyzed 11 million online reviews and found that early product deliveries can cause customers to rate products lower by an average of 0.2 stars. The researchers suggest this might occur because early arrivals interrupt the customer's mental process of justifying the purchase, a concept related to cognitive dissonance. The study also noted that financial compensation could mitigate negative reviews resulting from delivery timing issues.

Propaganda risk 10%
Claims checked 5
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center75%
Right25%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Early deliveries can lower product ratings by 0.2 stars, analysis of 11 million reviews finds Lisa Lock scientific editor Andrew Zinin lead editor When it comes to package delivery, early isn't always better.

Why it matters

A new study published in Production and Operations Management by researchers at the University of Iowa's Tippie College of Business finds that when a package that's ordered online is delivered earlier than the promised delivery date, the purchaser is apt to…

Common ground

The finding surprised researchers Salar Nozari and Soogand Alavi, assistant professors of marketing.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

A study published in Production and Operations Management analyzed 11 million online reviews and found that early product deliveries can cause customers to rate products lower by an average of 0.2 stars. The researchers suggest this might occur because early arrivals interrupt the customer's mental process of justifying the purchase, a concept related to cognitive dissonance. The study also noted that financial compensation could mitigate negative reviews resulting from delivery timing issues.

open_in_new Read the original article: https://phys.org/news/2026-04-early-deliveries-annoy-consumers.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 5 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 4
check_circle Corroborated 1
info
Claim 1: “A new study published in Production and Operations Management by researchers at the University of Iowa's Tippie College of Business finds that when a package that's ordered online is delivered earlier than the promised delivery date, the purchaser is apt to give it fewer stars when they leave an online review.”
SINGLE SOURCE
The claim references a specific study in 'Production and Operations Management' by the University of Iowa. While the web search results confirm the existence of the University of Iowa and mention academic research, none of the provided evidence explicitly corroborates the finding—that early delivery leads to fewer stars—or confirms the specific journal publication and researchers mentioned in the claim. The evidence is insufficient to corroborate the core finding across multiple independent sources.
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wikipedia NEUTRAL — Colony Brands, Inc. (formerly, The Swiss Colony, Inc.) is a mail-order and online retail company known for its cheese, sausage, chocolate, fruitcakes, and other food products. The company also feature…
https://en.wikipedia.org/wiki/Colony_Brands
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wikipedia NEUTRAL — Event management is the application of project management to the creation and development of small and/or large-scale personal or corporate events such as festivals, conferences, ceremonies, weddings,…
https://en.wikipedia.org/wiki/Event_management
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wikipedia NEUTRAL — Gerald L. Thompson (born November 25, 1923, Rolfe, Iowa; died November 9, 2009 Pittsburgh, Pennsylvania) was the IBM Professor of Systems and Operations Research (Emeritus) in the Tepper School of Bus…
https://en.wikipedia.org/wiki/Gerald_L._Thompson
+ 3 more evidence sources
info
Claim 2: “Nozari and Alavi said one exception to this is food deliveries, which customers are usually more familiar with and so an early delivery doesn't cause discomfort.”
SINGLE SOURCE
The claim regarding food deliveries being an exception because customers are more familiar with them is mentioned in the web search results for claims 3 and 4. While this exception is noted in the evidence, it is only presented within the context of the initial research findings and is not corroborated by independent, external sources in the provided evidence set.
travel_explore
web search NEUTRAL — The pandemic saw food delivery services mushroom in Luxembourg, growing a market that was largely dormant before, but change did not last in all segments.Customers want more and faster food but still …
https://www.luxtimes.lu/luxembourg/how-has-the-pandemic-tran…
travel_explore
web search NEUTRAL — Free online ordering from restaurants near you! With more than 30,000 restaurants in 500+ cities, food delivery or takeout is just a click away. Because with Grubhub: Click, click, food!
https://www.grubhub.com/
travel_explore
web search NEUTRAL — In this article, we will provide a guide on how to use these top food delivery apps. We will cover how to download and set up the apps, browse restaurants and menus, place orders, make payments, and t…
https://english.shanghai.gov.cn/en-UsefulApps/20240109/89844…
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Claim 3: “But when the delivery came before the window, the recipient also dinged the product, by an average of .2 stars.”
CORROBORATED
This claim, stating that early deliveries result in an average deduction of 0.2 stars, is reported identically across multiple web search results (the evidence provided for claims 3 and 4). This repetition across different search result contexts suggests corroboration from the source material the search engine indexed.
travel_explore
web search NEUTRAL — The two researchers analyzed online reviews of 11 million products left over the course of a year on an e-commerce platform.But when the delivery came before the window, the recipient also dinged the …
https://phys.org/news/2026-04-early-deliveries-annoy-consume…
travel_explore
web search NEUTRAL — The two researchers analyzed online reviews of 11 million products left over the course of a year on an e-commerce platform.But when the delivery came before the window, the recipient also dinged the …
https://www.newswise.com/articles/even-early-deliveries-anno…
travel_explore
web search NEUTRAL — White House officials on Wednesday highlighted what they called the early success of President Donald Trump’s signature tax cuts, saying millions of Americans have claimed new deductions this tax seas…
https://flvoicenews.com/leavitt-bessent-and-loeffler-highlig…
info
Claim 4: “The two researchers analyzed online reviews of 11 million products left over the course of a year on an e-commerce platform.”
SINGLE SOURCE
The claim states the researchers analyzed 11 million products over a year. This exact figure and scope are reported in the web search results for claims 3 and 4, suggesting the original source material contained this detail. However, the provided evidence does not contain multiple independent sources confirming this specific data point (11 million products over one year).
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wikipedia NEUTRAL — Eleven or 11 may refer to: 11 (number), the natural number following 10 and preceding 12 One of the years 11 BC, AD 11, 1911, 2011
https://en.wikipedia.org/wiki/11
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wikipedia NEUTRAL — 11:11, Eleven Eleven, or variations of the two, may refer to:
https://en.wikipedia.org/wiki/11:11
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wikipedia NEUTRAL — In numerology, 11:11 is considered to be a significant moment in time for an event to occur. It is seen as an example of synchronicity, as well as a favorable sign or a suggestion towards the presence…
https://en.wikipedia.org/wiki/11:11_(numerology)
+ 3 more evidence sources
info
Claim 5: “They found that when the delivery was made later than the platform promised, it led to a loss of .4 stars on average for products compared to on-time deliveries, presumably because the customer wasn't happy about waiting.”
SINGLE SOURCE
The claim specifies a loss of 0.4 stars for late deliveries. This specific quantitative finding is only present in the web search results associated with claims 3 and 4. No other independent sources corroborate this precise numerical finding.
travel_explore
web search NEUTRAL — On-time delivery rate by carrier and lane. Average delay duration. Cost per delayed shipment.Effective time-slot management turns delivery timing into a controlled process instead of a guessing game. …
https://scsolutionsinc.com/late-deliveries/
travel_explore
web search NEUTRAL — By preventing late deliveries, Hollingsworth can help you retain customers, boost your customer lifetime value, and increase your return on investment. All you’ll have to worry about is what to do wit…
https://www.hollingsworthllc.com/how-late-deliveries-impact-…
travel_explore
web search NEUTRAL — Late deliveries occur when shipments arrive after the promised time. Discover what causes delivery delays and how they affect businesses and customer experience.
https://locus.sh/resources/glossary/late-deliveries/
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.