Online shopping / subscriptions

If you can delay an online purchase after putting the product in the trolley, profit algorithms will sometimes bargain with you down to a point where you still make a purchase and they still make a profit.

When I went to cancel/pause my Audible membership, after clicking "Yes" to a few "Are you sure?" messages, I was offered three months for 99c, still including the 1 book credit per month offer. The profit algorithm had calculated that keeping me around and potentially making a loss for three months would pay itself back if I took up full membership again, and that I was probably more likely to do that than if I had just paused or stopped my membership.