The basic idea has been around for a while, but retailers in general are not interested in the added infrastructure costs, also an issue with advanced methods, like product tagging.
"Intelligent foam could keep shop shelves stacked A grid of many individual sensor "cells" can detect products on a shelf (Image: Applied Physics Letters) ... Store shelves that know when they need restocking are one of many potential applications for a novel sensing foam developed by researchers in Europe.
Shelves fitted with a thin layer of the foam can tell when products are out of stock, allowing a store to automatically monitor supply. And the foam could give other objects and surfaces sensing abilities, the researchers say ... "
Technical reference.
The basic idea has been around for a while, but retailers in general are not interested in the added infrastructure costs, also an issue with advanced methods, like product tagging. 
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