One lucrative -- and controversial -- form of arbitrage is now going on in the online ad markets
The concept is straightforward: Buy cheap traffic for your website from one search engine, get paid more for the ads streamed from another.
First, pick an industry, be it a big-volume subject like dating or a narrower topic like gourmet food. Set up a site, but don't buy an expensive domain name, since you're not looking for people typing directly into the browser's address bar. Write a few basic paragraphs about your subject, slap on some images, open an account with Google's AdSense program, and you're off.
Google has long been the favorite place to buy paid search ads, but traffic arbitrageurs say that right now Microsoft's AdCenter is a great source of cheap, good-quality traffic.
You can use a keyword tool like Keycompete.com to see what the competition is doing, and Microsoft's AdCenter will help you generate keywords.
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