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Bias in expert product reviews

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  • Vollaard, Ben
  • van Ours, Jan C.

Abstract

Many expert reviews of products such as cars, books, movies and restaurants are non-blind. Whether such reviews can be taken at face value is questionable, but hard evidence on the presence of reviewer bias is rare. This holds particularly true for conflicts of interest that are thought to be common in non-blind product reviews but are not readily observable: ad hoc relationships between reviewers and producers. We present a textbook case of a long-running expert product review in the food service industry for which we know the reviewer’s conflict of interest: being affiliated to one particular producer. As is typical, only insiders were aware of the possible source of bias in the review. The review resembles other non-blind tests of product quality. We find evidence of a sizable bias in the reviewers’ ratings. Our findings suggest that reviewers’ ad hoc relationships with producers, often dismissed as ‘coming with the job’, can be very harmful.

Suggested Citation

  • Vollaard, Ben & van Ours, Jan C., 2022. "Bias in expert product reviews," Journal of Economic Behavior & Organization, Elsevier, vol. 202(C), pages 105-118.
  • Handle: RePEc:eee:jeborg:v:202:y:2022:i:c:p:105-118
    DOI: 10.1016/j.jebo.2022.08.002
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    1. Dina Mayzlin & Yaniv Dover & Judith Chevalier, 2014. "Promotional Reviews: An Empirical Investigation of Online Review Manipulation," American Economic Review, American Economic Association, vol. 104(8), pages 2421-2455, August.
    2. Santosh Anagol & Shawn Cole & Shayak Sarkar, 2017. "Understanding the Advice of Commissions-Motivated Agents: Evidence from the Indian Life Insurance Market," The Review of Economics and Statistics, MIT Press, vol. 99(1), pages 1-15, March.
    3. Lin, Hsiou-wei & McNichols, Maureen F., 1998. "Underwriting relationships, analysts' earnings forecasts and investment recommendations," Journal of Accounting and Economics, Elsevier, vol. 25(1), pages 101-127, February.
    4. Dobrescu, Loretti I. & Luca, Michael & Motta, Alberto, 2013. "What makes a critic tick? Connected authors and the determinants of book reviews," Journal of Economic Behavior & Organization, Elsevier, vol. 96(C), pages 85-103.
    5. Victor A. Ginsburgh & Jan C. van Ours, 2003. "Expert Opinion and Compensation: Evidence from a Musical Competition," American Economic Review, American Economic Association, vol. 93(1), pages 289-296, March.
    6. Tommaso Colussi, 2018. "Social Ties in Academia: A Friend Is a Treasure," The Review of Economics and Statistics, MIT Press, vol. 100(1), pages 45-50, March.
    7. Alessandro Lizzeri, 1999. "Information Revelation and Certification Intermediaries," RAND Journal of Economics, The RAND Corporation, vol. 30(2), pages 214-231, Summer.
    8. Colussi, Tommaso, 2015. "Social Ties in Academia: A Friend is a Treasure," IZA Discussion Papers 9414, Institute of Labor Economics (IZA).
    9. Stefano Dellavigna & Johannes Hermle, 2017. "Does Conflict of Interest Lead to Biased Coverage? Evidence from Movie Reviews," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 84(4), pages 1510-1550.
    10. Dewenter Ralf & Heimeshoff Ulrich, 2014. "Media Bias and Advertising: Evidence from a German Car Magazine," Review of Economics, De Gruyter, vol. 65(1), pages 77-94, April.
    11. Michael Anderson & Jeremy Magruder, 2012. "Learning from the Crowd: Regression Discontinuity Estimates of the Effects of an Online Review Database," Economic Journal, Royal Economic Society, vol. 122(563), pages 957-989, September.
    12. Tom Hamami, 2019. "Network Effects, Bargaining Power, and Product Review Bias: Theory and Evidence," Journal of Industrial Economics, Wiley Blackwell, vol. 67(2), pages 372-407, June.
    13. Cecilia Rouse & Claudia Goldin, 2000. "Orchestrating Impartiality: The Impact of "Blind" Auditions on Female Musicians," American Economic Review, American Economic Association, vol. 90(4), pages 715-741, September.
    14. Reuter, Jonathan, 2009. "Does Advertising Bias Product Reviews? An Analysis of Wine Ratings," Journal of Wine Economics, Cambridge University Press, vol. 4(2), pages 125-151, January.
    15. Michaely, Roni & Womack, Kent L, 1999. "Conflict of Interest and the Credibility of Underwriter Analyst Recommendations," The Review of Financial Studies, Society for Financial Studies, vol. 12(4), pages 653-686.
    16. Véronique Chossat & Olivier Gergaud, 2003. "Expert Opinion and Gastronomy: The Recipe for Success," Journal of Cultural Economics, Springer;The Association for Cultural Economics International, vol. 27(2), pages 127-141, May.
    17. Imke Reimers & Joel Waldfogel, 2021. "Digitization and Pre-purchase Information: The Causal and Welfare Impacts of Reviews and Crowd Ratings," American Economic Review, American Economic Association, vol. 111(6), pages 1944-1971, June.
    18. Goldin, Claudia D. & Rouse, Cecilia, 2000. "Orchestrating Impartiality: The Impact of “Blind†Auditions on Female Musicians," Scholarly Articles 30703974, Harvard University Department of Economics.
    19. David A. Reinstein & Christopher M. Snyder, 2005. "The Influence Of Expert Reviews On Consumer Demand For Experience Goods: A Case Study Of Movie Critics," Journal of Industrial Economics, Wiley Blackwell, vol. 53(1), pages 27-51, March.
    20. Yubo Chen & Jinhong Xie, 2005. "Third-Party Product Review and Firm Marketing Strategy," Marketing Science, INFORMS, vol. 24(2), pages 218-240, February.
    21. Amanda Hollenbacher & David Yerger, 2001. "Third party evaluations and resale prices in the US used vehicle market," Applied Economics Letters, Taylor & Francis Journals, vol. 8(6), pages 415-418.
    22. S. Ravid & John Wald & Suman Basuroy, 2006. "Distributors and film critics: does it take two to Tango?," Journal of Cultural Economics, Springer;The Association for Cultural Economics International, vol. 30(3), pages 201-218, December.
    23. Danielle Li, 2017. "Expertise versus Bias in Evaluation: Evidence from the NIH," American Economic Journal: Applied Economics, American Economic Association, vol. 9(2), pages 60-92, April.
    24. Victor Ginsburgh & Renato Flores Galvao, 1996. "The Queen Elisabeth Musical Competition: how fair is the final ranking," ULB Institutional Repository 2013/1713, ULB -- Universite Libre de Bruxelles.
    25. Tom Hamami & James Bailey, 2021. "Expert product reviews and conflict of interest," Managerial and Decision Economics, John Wiley & Sons, Ltd., vol. 42(1), pages 170-176, January.
    26. Ashenfelter, Orley & Jones, Gregory V., 2013. "The Demand for Expert Opinion: Bordeaux Wine," Journal of Wine Economics, Cambridge University Press, vol. 8(3), pages 285-293, December.
    27. Michael Luca & Georgios Zervas, 2016. "Fake It Till You Make It: Reputation, Competition, and Yelp Review Fraud," Management Science, INFORMS, vol. 62(12), pages 3412-3427, December.
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