power wall

The small outlet has to adopt such marketing strategems as a "power wall" displaying goods most in demand as customers enter, or positioned at the back of the store so that they are led past other goods that may catch their eye.

They're called "power walls"—those highly visible shelves behind convenience store cashiers. Tobacco companies pay big bucks to use them ($100 million in Canada in 2005), admitting the walls are their single most effective advertising tool.