My wife used to sell used books on Amazon part-time a few years ago, mostly as a hobby to feed her own library. She employed some software and pricing algorithm

My wife used to sell used books on Amazon part-time a few years ago, mostly as a hobby to feed her own library. She employed some software and pricing algorithms, similar to the ones mentioned in the post. Often, she'd go to library or estate sales and just scan hundreds of books. If they met her pricing targets, she'd buy them. But one time a book she scanned had an incorrect barcode number (it wasn't clear if Amazon had the incorrect barcode or what), but so did several other sellers of the same book. When she posted the book for sale, it came up with a different title, but she hadn't noticed while she was posting inventory. Initially my wife assumed she'd lost the inventory when someone tried to buy from her, but it wasn't until she tried to drop ship from another seller that they realized what was going on. The sellers all had to cancel their orders with each other on down to the buyer, who took it in stride. But, with Amazon, you can still rate sellers who cancel your order, so there's at least that risk...