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Re:Ask HN: Why don't publishers serve ads from their domains... by ahp on Tuesday September 15, 2015 @02:47PM (#10222457)
> 6. Ad-exchange receives all the bids and picks the second highest bidder (no idea why it's the second highest)

It's called a Vickrey Auction. It allows bidders to bid their true value (instead of trying to outbid all of the other bidders, as is what results from a first-price auction).

https://en.wikipedia.org/wiki/Vickrey_auction

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