I read one study that showed having eyeballs (e.g., a picture of someone looking at you) next to the cash box increased deposits by some N% (I don't want to spo

I read one study that showed having eyeballs (e.g., a picture of someone looking at you) next to the cash box increased deposits by some N% (I don't want to spout facts as I can't recall the number, but it was n > 10 - double digit percentage increase). They controlled for there just being a picture by alternating pictures of eyeballs with pictures of flowers. I suspect part of it may be due to people showing up just for the novelty of it, but going back to the eyeball study (which I am too lazy to look up the reference for) I wonder if there is another thing at play too. Perhaps people think oh cool, let's show up and game the system, and they make plans to go there intending to perhaps pay 20% less than market. Then they have to look the owner in the eye and tell him what they think is fair, and for whatever reason their mind changes. So rather than paying .8x, like they originally intended, they end up paying instead x - 1.2x So you get increased business because people who were willing to pay .8x (lets say x = $10 based on the article, so $8) show up, and end up spending x - 1.2x ($10-12, per the article). Some portion of new customers may see that their game won't work (because they don't want to lie to the owner) and they just leave. No harm done - these people weren't eating at the cafe to begin with. So I chalk at least part of this up to a neat psychological trick - but I wonder if many of those people will be repeat customers (some portion obviously will). Anybody have references to back this up? This is just what I suspect may be happening, as it's what I susepct happened with folks who may have intended to steal bagels/candy from the office kitchen, saw the eyeballs and ended up paying for them instead.