Summary:
PPC Arbitrage is essentially buying traffic from PPC (Pay-per-Click) traffic source, like AdWords, as an advertiser, and directing it to another PPC system (like AdSense) as a publisher. If you consistently make more money than you spend, you get PPC Arbitrage.
Name of the pattern:
PPC Arbitrage
When to use the pattern:
When you know very well what you are doing, especially how to get cheap traffic, how to ensure good click-through, and what to promote to get the sales and top buck.