Recently grocers and restaurant chains have started to employ a sophisticated type of digital advertising. The videos and images influence a shopper's decisions as they browse supermarket aisles or wait in line to pay. At select Metro Extra uses digital screens to sway a shopper. Certain goods have special tags attached to them, so when you grab a box of Kellogg's Frosted Flakes, the eye-level screen changes its message to display a sale price for, say, Wheaties.

At a time when shoppers are more cautious about how they spend their money, this could give certain food companies an edge. What do you think: Is this new advertising scheme brilliant, or does the technology to increase impulse buys creep you out?

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