In theory, instead of paying for $20,000 for hundreds of thousands of clicks every month, an advertiser would only pay for the clicks that resulted in a sale. If you're thinking that means you'll be able to get the same sales and only spend $1,000 with Google next month, think again.
It's still going to be an auction marketplace, and the cost per action will be a function of what the major players feel a conversion is worth to them. So instead of paying 50 cents for a click, you may be paying $50 for a sale. Or $500. If your bid is too low, your ad simply won't appear.
PPA ads will only be available in Google's AdSense network, not in search engine results pages. Here are some of the most likely impacts:
- Affiliate marketing companies like Commission Junction are going to get hit hard, because this puts them in direct competition with Google.
- Publishers will have to choose to place these ads, which shift some financial risk away from advertisers to publishers. This means that advertiser demand will drive adoption.
- Google will continue its Borg-like advance towards eventual global advertising domination.


