"Advertising encourages spur-of-the-moment emotional purchases that are triggered by seeing the product, according to the editorial. The way food is arranged in a grocery store can have a big impact on what consumers buy. A 2009 study showed products placed at the end of the aisle account for 30% of all supermarket sales."
http://thechart.blogs.cnn.com/2012/10/10/impulse-buying-isnt-entirely-your-fault/