Prior Product Knowledge Bias about NGP Goods Affects Post-Purchase Surveys

Olivier Mesly

Journal of Economic Issues, 2025, vol. 59, issue 2, 619-637

Abstract: This study delves into the economic consequences of prior product knowledge in post-purchase satisfaction surveys, focusing on the used car and real estate sectors as case examples, for so-called NGP goods. I resort to the five-step purchasing model and focus on the link between the step of information gathering and the post-purchase step, whereby market agents are seen or act with dubious motives. This research seeks to provide these embryonic yet valuable insights through linear regressions and path analysis. My study introduces my novel concept of the NGP framework, which refers to the interplay between consumer needs (N), objectives/goals (G), and preferences (P) in relation to products of high economic and/or emotional value, thereby enriching the current understanding of buying behavior and economic theory about unique kinds of products, such as Veblen and Giffen goods. I offer practical recommendations for businesses aiming to minimize the prior product-knowledge bias-related impacts. The findings can guide companies in designing more effective survey instruments and making informed economic decisions based on accurate assessment of customer feedback.

Date: 2025
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DOI: 10.1080/00213624.2025.2493587

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