The following graphs are showing the trends of Online Advertising Cost. Online Advertising Cost's other name is Cost per mile or Cost per one thousand page impression (CPM). Actually, advertiser is responsible to pay either cost per click or cost per thousand page impression. The trends are last 9 months of 2009 and divided into three parts quarterly . Almost all the cost has been decreased due to global slump. This loss will have to bear to all web publishers and bloggers.