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January 22, 2026International Journal of Wine Business Research

Concordance or conflict? A 40-year longitudinal study of a South African wine club versus expert ratings and price

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Authors

HOHanjo OdendaalNVNick VinkELErik Loubser

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Overview

Longitudinal analysis reveals low agreement between expert and consumer wine ratings, suggesting divergent quality perceptions with impacts on pricing.

Key Points

  • This research investigates how expert and consumer wine ratings relate to wine prices and their agreement over time.
  • Analyzed 693 paired wine ratings from experts and an informal wine club spanning 1987–2024.
  • Evaluated agreement using Cohen’s weighted kappa statistic.
  • Utilized a Bayesian regression model to assess the correlation between ratings and price.
  • Expert and wine club ratings show very low agreement but both predict wine prices independently.
  • Expert ratings have a stronger influence on pricing than consumer ratings.
  • The relationship holds for both red and white wines.

Cite This Study

Odendaal et al. (2026) studied this question.

synapsesocial.com/papers/6971bdcf642b1836717e2757https://doi.org/10.1108/ijwbr-06-2025-0038
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Also Consider

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  4. 4Decoding the Italian Wine Market: A Quantitative Macro-Economic Examination of Price and Expert Rating Influences2024
  5. 5Commercial, Cultural and Social Aspects of Related to the Winegrowing Sector2024