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It’s also worth mentioning that the fill rate has an inverse relationship with the floor price - high floor prices can lead to lower fill rates, as fewer advertisers meet the price, while low floor prices might yield higher fill rates. The key is striking a balance to optimize both ad revenue and fill rate.
By using floor prices to achieve a higher CPM and ensure high-quality ads a 100% fill rate is not the goal. On the contrary, a 100% fill rate may sometimes translate to low-quality ads.
Fill Rate (%) = (Impressions / (Impressions + Unfilled Impressions)) * 100
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