Thanks E.T. for this link- article written for the New York Times (oped) by CASS R. SUNSTEIN AUG. 20, 2014.

"What do Americans actually think about predictive shopping? To find out, I produced a nationally representative survey, conducted with about 500 respondents, with a margin of error of plus or minus 4.5 percentage points.
I discovered, to my surprise, that a significant percentage of Americans already welcome predictive shopping.
The situation was presented like this: Suppose that over the years, your favorite online bookseller has compiled a great deal of information about your preferences. On the basis of a new algorithm, it thinks it knows what you will want to buy before you do. I asked, would you enroll in a program in which the seller sent you books that it knew you would purchase, and billed your credit card? (Anyone could send the book back for a refund or just opt out of the program.) Fifty-nine percent said no, but 41 percent said yes.
Second, I explored whether people would react differently if sellers signed people up without their consent. I asked, would you approve or disapprove if the seller automatically, and without your explicit consent, enrolled you in a program in which it sent you books that it knew you would purchase, and billed your credit card?
Twenty-nine percent said they would approve, and 71 percent said they would disapprove. People do care about explicit consent. Nonetheless, it is noteworthy that nearly a third of Americans would approve of such a program.
Books are, of course, an unusual commodity. We might like the idea of stumbling onto new topics and ideas. Whenever shopping itself is fun, whenever serendipity and surprise are valuable, we might want to choose on our own, hence reject predictive shopping. "

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