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Apparently Nordstrom did an experiment with this for a while - http://www.nytimes.com/2013/07/15/business/attention-shopper... - even going as far as monitoring passing traffic so you could monitor the percentage of people passing who actually come into the store. This could be pretty fascinating in the context of running certain types of window displays, sales/offers, etc, and lead to ecommerce-style split testing and the like. It says they stopped the experiment partly due to people whining though, but I imagine it'll just go 'under the radar' in future since it could be too valuable not to try.

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