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📝 Intro

People trust others’ reviews more than what marketers say.

But they also know that companies can try to hide negative reviews, incentivize positive reviews, or - unethically - plant fake positive reviews. Even more so if the reviews are on the company’s own website (vs on Google or TripAdvisor).

So when a website is splattered exclusively with 5-star reviews, it might be a sign that something is off.

This study from Northwestern University and University of Amsterdam analyzed the effect that different average star ratings had on actual sales of 3 ecommerce retailers.

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Review ratings between 4 and 4.5 sell more than those between 4.5 and 5

Impacted metrics: Customer acquisition
Channels: Reviews
For: B2C. Can be tested for B2B
Research date: June 2016

📈 Recommendation

Aim to show an average review rating of between 4 and 4.5 stars, not only perfect 5 stars reviews. 

For example, it’s alright to have some negative reviews that lower your average, especially if they are irrelevant (e.g. a bad rating because the item doesn’t deliver to a specific location, not because the product is bad).

Your sales will be higher.

🎓 Findings

• Products with an average rating of 4.5 to 5 stars have lower sales than those with between 4 and 4.5 stars.

• Average review ratings increase sales as they go up and peak at between 4 and 4.5 stars, then slightly lower them again (it’s still better to have a 5-star rating than a 3 star rating).

• This study didn’t find a strong relationship between a high number or reviews and more sales. In fact, for some products (e.g. natural hair care products, herbal vitamins) too many reviews seemed to slightly reduce sales (but the effect was not significant).

🧠 Why it works

• For many products, especially if they are low risk (e.g. a small purchase) or when we are mentally overloaded, we don’t dig into the detailed content of reviews. Instead, we rely on what the average rating is.

• If the average rating is extremely high, we tend to think that they are too good to be true. We suspect that the company could have manipulated them.

• Instead, when some negative reviews are present but the rating is still good (4 to 4.5 stars), we assume that the reviews honestly discussed both positive and negative aspects, but the product still came out as great.

✋ Limitations

• It’s unclear whether it’s better to have 10 good (e.g. 4-star) reviews or mostly excellent reviews (e.g. 5-star) and a handful of negative ones. Based on previous research, it might be the latter.

• This study focused exclusively on reviews shown on companies’ own websites, where reviews might be more easily manipulated. People might have a different reaction to extremely high ratings on 3rd party platforms (e.g. Trustpilot, TripAdvisor), where it’s harder to manipulate them.

• The retailers in the study sold different types of products (e.g. light bulbs, women's athletic shoes), but these were all physical products. It’s unclear whether the effect stands for online products, services, or more expensive items.

🏢 Companies using this

• Typically, companies follow one or a mix of the following approaches:

  • Aim to show the highest possible rating, sometimes incentivizing positive reviews

  • Try to suppress or hide negative reviews

  • Hands-off, paying little attention to review ratings

• When companies highlight star ratings of reviews on their homepages (e.g. Basecamp) they tend to only show 5-star ratings.

⚡ Steps to implement

• When you have great reviews, don’t try to hide or censor a few negative reviews that will average things out, unless it’s your first review and it’s negative.

• If you constantly receive low ratings, improve your product or service, or stop selling it.

• Show good reviews on your homepage, especially if they address customers’ main objections, and experiment with showing them in ads or in other channels (e.g. email).

🔍 Study type

Market observation (analysis of sales of 3 ecommerce retailers between 29 Jun 2014 and 11 October 2014)

📖 Research

Too good to be true: the role of online reviews’ features in probability to buy. International Journal of Advertising (June 2016).

[Link to paper]

🏫 Researchers

• Ewa Masłowska. University of Illinois Urbana-Champaign

• Edward Malthouse. Northwestern University

• Stefan Bernritter. King's Business School, King's College London

Remember: This is a scientific discovery. In the future it will probably be better understood and could even be proven wrong (that’s how science works). It may also not be generalizable to your situation. If it’s a risky change, always test it on a small scale before rolling it out widely.

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