Suppose a book vendor pitches an eBook on a tablet and the user clicks to pay for it. To a degree that might be because the vendor has cloud software that includes a scientifically valid prediction algorithm that has modeled the user correctly. Or it might be because users have been told the algorithms are smart, or maybe the user’s attention is monopolized through a proprietary tablet. Perhaps the user would have equally been ready to buy any number of other books. It’s not easy to tell which cause is more important.