First Impression

A great way to increase your earnings through Adsense is to place multiple ad units on webpages that are rich with content. Now, to increase your revenue through Multiple Ad Units is to make sure the ad unit with the highest CTR is the first ad unit in the page. To know which ad unit has the highest CTR here's an insider tip on how the ad units are placed on your page by Google Adsense Team:

Currently, the first ad unit on a page always shows the top ads that win the ad auction. Also, if there aren't enough ads in our ad inventory to fill all of the ad units on a page, the first ad unit on the page will display ads first. This is why we recommend using custom channels to determine which of your ad units has the highest CTR, and then placing that ad unit first in the HTML code.

The first ad unit on the page is defined as the first instance of the ad code within the HTML of the page. Keep in mind that the first ad unit in the source code is not always the first ad unit that your users will see when the page finishes loading in their browser. For example, if you use DIV tags, our system may recognize an ad unit which users see at the bottom of the page as the first ad unit.

Armed with this morsel of knowledge now you can maximise your earnings by placing Multiple Ad Units in your page codes and see your earning soar...