Revisiting the Economics of Quality Score: Why QS Is Up to 200% More Valuable in 2013

In this post of blog www.wordstream.com, we can check about how important is and will be Quality Score in 2013:

http://www.wordstream.com/blog/ws/2013/03/26/google-quality-score?mkt_tok=3RkMMJWWfF9wsRojva%2FPZKXonjHpfsX86OokWaCzlMI%2F0ER3fOvrPUfGjI4HRMNlI%2FqLAzICFpZo2FFPFfKRb5RS%2F%2FRQ