Maximize revenue with DFP Small Business and AdSense
Many publishers don't sell all of their ad inventory. In these situations, publishers might not serve any ads or might serve less valuable house ads, therefore losing potential earnings. Google AdSense is integrated with DFP Small Business so publishers will always have an ad to serve in an undersold situation.
AdSense is also able to compete in real time on price with your non-guaranteed inventory to make sure you're always showing the most valuable ads. If AdSense can pay you more than the alternative, an AdSense ad will show. When that's not the case, an ad from your highest paying non-guaranteed inventory will be shown.
Google will always serve the highest paying AdSense ad available, and will never lower the price of the winning ad, or reduce your earnings from it.