Measuring cost per action advertising
In the first article in this series, I suggested changing the pricing of advertising campaigns based on impressions to pricing them based on the number of clicks. And in the second article, I went a little bit further and argued that it might be even better to agree on a cost per action pricing scheme.
If an advertiser is considering ending an impression based or click based advertising campaign, a publisher could try to turn the relationship into a partnership by offering CPA (cost per action) advertising. In that scenario, the site publisher will get paid for a specifically defined outcome that the advertiser is aiming for.