by Marta Turek
http://www.mediative.ca‘All signs point to this being a normal effect of switching out destination URLs; i.e. the AdWords system is working as intended.’ - Google AdWords Rep
This is the feedback that the Google Rep provided pertaining to a campaign in which average CPC (cost-per-click) doubled over a period of 8 weeks as landing pages were switched over from one destination URL to another.