You can just change to the the following experiment: You walk into your local grocery store. A store employee, stops you at the door and asks, 'If you hand ove

You can just change to the the following experiment: You walk into your local grocery store. A store employee, stops you at the door and asks, 'If you hand over your phone for a second, I will quickly copy over its contents onto my computer. Then, while you shop, I will read through your recent your messages, your emails, your browsing history. Based on that, I will recommend a product or two I think you will find useful. Do we have a deal?' I don't think many people would actually go through with this (rather than just say they would), if we actually did this experiment. Remember, someone got beaten up for wearing google glasses in public and not taking them off when requested. Humans are really bad at thinking in the abstract, but when things are there in the flesh, is when real preferences are revealed.