What is the most important metric to track on ecommerce ad platforms?

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The most important metric to track on eCommerce ad platforms is Return on Ad Spend (ROAS). ROAS measures the revenue generated for every dollar spent on advertising. It directly indicates the effectiveness and profitability of your ad campaigns. A higher ROAS means that your ads are generating more revenue relative to their cost, making it a crucial metric for assessing the performance and optimizing your eCommerce advertising strategy.