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Related item recommendations (RIRs) are ubiquitous in most online platforms today, including e-commerce and content streaming sites. These recommendations not only help users compare items related to a given item but also play a major role in bringing traffic to individual items, thus deciding the exposure that different items receive. With a growing number of people depending on such platforms to earn their livelihood, it is important to understand whether different items are receiving their desired exposure. To this end, our experiments on multiple real-world RIR datasets reveal that the existing RIR algorithms often result in very skewed exposure distribution of items, and the quality of items is not a plausible explanation for such skew in exposure. To mitigate this exposure bias, we introduce multiple flexible interventions [fair related item recommendation (FaiRIR)] in the RIR pipeline. We instantiate these mechanisms with two well-known algorithms for constructing RIRs&#x2014;rating singular value decomposition (SVD) and item2vec&#x2014;and show on real-world data that our mechanisms allow for a fine-grained control on exposure distribution, often at a small or no cost in terms of recommendation quality, measured in terms of relatedness and user satisfaction.

FaiRIR: Mitigating Exposure Bias From Related Item Recommendations in Two-Sided Platforms