Reviewers given discounts or free products award higher ratings,detrimentally affecting Amazon’s star systemSo-called incentivised reviews, where people are given products in return for write-ups on Amazon, or are skewing results,artificially increasing the star ratings, according a report.
Such reviews must have a disclaimer typically saying: “I received this product for free or at a reduction in exchange for my honest, or unbiased review” or something similar,according to Amazon’s guidelines.
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Source: theguardian.com