This video explains the mechanics of the single most important online business. This is how Google makes ~98% of its $20 billion/year revenues, and probably 100% of its $13 billion/year profit.

Online startups would do well to learn how this works. I'm surprised it hasn't gotten voted up more.

This is great info, but I would have liked it if the video looked at more sides of the equation. Granted, the advertisers have the most complicated corner of the triangle, but figuring out what I earn as an ad seller is equally useful... which also lets us solve for what Google's share is.

If you want to learn more about this topic, check out the book mentioned in this http://news.ycombinator.com/item?id=509407 thread

Carrot should be placed very close to donkey head. "Just one cent above my bid! Beat it!"