Google believes it can make more money by placing some of its ads below its search results instead of alongside them.

The reshuffling began appearing on Google's website on Wednesday. The shift won't preclude ads from still appearing in the right column next to the search results.

Google found that certain ads generate more clicks when they appear at the bottom of the page. That's important to Google because it gets paid a certain amount each time an advertising link gets clicked. The company didn't specify what kinds of ads are likely to get the bottom-page billing.

Google Inc., which is based in Mountain View, California, regularly tweaks its search formula and advertising system in an effort to deliver better results to Web surfers and companies trying to promote their products.
The company's tactics have proven highly effective so far. Google handles about two out of every three Internet search requests. It is expected to sell more than $35 billion in advertising this year.

Today we’re continuing our long-standing series of blog posts to share the methodology and process behind our search ranking, evaluation and algorithmic changes. This summer we published a video that gives a glimpse into our overall process, and today we want to give you a flavor of specific algorithm changes by publishing a highlight list of many of the improvements we’ve made over the past couple weeks.

We’ve published hundreds of blog posts about search over the years on this blog, our Official Google Blog, and even on my personal blog. But we’re always looking for ways to give you even deeper insight into the over 500 changes we make to search in a given year. In that spirit, here’s a list of ten improvements from the past couple weeks: