Due to the much lower bids, the advertiser's brazil phone number list conversion volume skyrocketed and never automatically recovered. Here is what happened. Auction automation correctly saw a drop in conversion rate and lower adjusted bids. But as a dumb automation, it never asked why the conversion rate dropped. The humans knew it was because brazil phone number list a new landing page had launched. Humans would have known that the correct response to this event was to return to the previous landing page rather than to lower the bid.
Machine learning is bad, very bad at explaining brazil phone number list why and how. Show him a picture of a cat and he knows it's a cat. But good luck getting him to explain why it's a cat. In my book on the future of digital marketing, I explain that one of the roles humans should play is that of a ppc driver, someone who monitors automations and can make course brazil phone number list corrections if bad data leads bad deeds.
Understand what the machine does and make brazil phone number list sense of the data it uses to make its decisions. That's pretty much what hal varian said in the quote I mentioned earlier. If automation doesn't work or you don't trust it, consider automation overlayif you think automation will become even more ubiquitous in ppc in the future, it makes sense brazil phone number list that we should learn how the automations given to us by engines work so that we can optimize them by managing their parameters.