I read a lot about this phenomenon called sart pricing, but what exactly is it? Apperently people make more cpc in their first weeks of joining adsense and then their ecp drops afterwards. Is this true for everyone? I read that it only happens to people with a low conversion rate. What does "conversion" mean?
Conversion rate refers to the ratio of visits to an action on your website. This could be buying your website product, a click on your ads, sign up etc...