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    "prose": "Allison and Nick Bracken purchased a 12-meter school bus on eBay in June 2021 for $5,000. [^1]\n\nE-commerce search ranking must balance multiple objectives including relevance, user engagement, and platform revenue when allocating impression slots to competing listings. [^2]\n\nEstimating expected revenue is well understood for fixed-price items but becomes challenging when inventory includes mixed listing formats such as pure auctions and hybrid 'Auction with Buy It Now' (ABIN) items. [^3]\n\nOnline A/B tests at a large e-commerce platform showed positive revenue gains and statistically significant improvements to user metrics. [^4]\n\nThe authors extend the standard Expected Cost-per-Mille (eCPM) framework by deriving a marginal eCPM (meCPM) that captures the incremental value of showing one more impression of an item whose price is still evolving. [^5]\n\nThe couple converted the bus into a mobile home over a period of less than three years using YouTube videos as instructional references. [^6]\n\nThe total renovation cost for the bus conversion was approximately $40,000. [^7]\n\nThe couple now travels through the United States and Canada in the converted bus. [^8]",
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