That sea of used cars on a dealer’s lot suggests they came from trade-ins, but that’s often not the case. The little-seen world of wholesale auto auctions is where the secret life of used cars plays out: It’s where the companies that sell used cars come to get them.

I recently spent the morning at the Manheim SF Bay auction facility in industrial Hayward, California. It’s sort of a cross between a carnival, a stockyard and a car show. Hundreds of cars come in as trade-ins, lease returns, insurance totals, retired rentals or company fleets to find a buyer who will later sell the car to you.

Far from the ooh-and-ahh atmosphere of a collector car auction like Pebble Beach, this auction is all about efficiency; no spectators or retail buyers allowed. Savvy wholesale bidders crowd a series of 10 lanes as late-model cars come through them simultaneously, with condition data displayed on an overhead screen and in marker on the windshield. As the car rolls in front of an elevated auctioneer stand, the fast banter begins, bid numbers are flicked and the sold car rolls out a door at the other end. The whole process takes about 45 seconds per vehicle. In a few hours the car is on a truck to the bidder’s lot, where it gets marked up and sold to you.

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