[antonb2011]

Looks like the techniques of the world of High Frequency Trading are migrating into the wider universe. Except now the customers may benefit if the prices are lowered by someone who wouldn't sell at that price (by, say, showing that the product is in stock, but showing an error when you try to add it to your cart) in an attempt to make their competitors' algorithms follow the price drop, in order to deplete the stocks of goods in the process.