X-efficiency in a push ad campaign reflects how well resources are used to generate results. In affiliate marketing, this means efficiently converting impressions into clicks and sales. A highly X-efficient campaign uses minimal effort and budget to reach the right audience and drive conversions, indicating strong performance. However, X-efficiency alone doesn't fully capture success—it must be paired with measurable outcomes like return on investment (ROI), customer acquisition, and retention rates. An affiliate campaign may be X-efficient but still fail if it targets the wrong audience or promotes low-quality products. Therefore, while X-efficiency is a useful indicator of operational effectiveness, true success in affiliate marketing depends on both efficient execution and meaningful, profitable results.