Web page real estate - how to use it?

Here is an interesting question: If you have 20% space to spare on your web page, what would you choose to get more money?

 

The choice might not be easy. Fortunately, there are methods to find out:

We are in an interesting position at ProductWiki as we generate our revenue from two different sources of pay-per-click (PPC) advertising: Google AdSense and Shopping.com Merchant Listings. These ads show up on all of our product pages (never at the same time) and each type of ad gets approximately a 50% share of our page views across a broad spectrum of products.
I've compiled data contrasting the performance of Shopping.com and Google AdSense on ProductWiki taken from a one week period at the end of last month.

	Shopping.com	AdSense
Clickthrough rate (%)	29%	6.5%
Revenue per click ($/click)	$0.21	$0.19
eCPM ($/1000 impressions)	$59	$13

Taking a look at the most significant of these figures (eCPM), Shopping.com outperforms AdSense by a factor of 4.6!

https://blog.productwiki.com/2006/08/dont-settle-for-google-adsense.html