You'd have to be an idiot to be working class and vote Trump. Especially if you're union and vote Trump. There's Chickens for Colonel Sanders for you...
Easy. Manufacturers pay for endcap displays and choice shelf space. It's advertising for them. (source: I work for a brewery, and that's how they put together the beer aisle. I've seen the software used to build the shelf arrangements.)
Grocery chains have software for putting together shelf arrangements. Suppliers have to pay if they want their products at a quality location at eye level, or near the ends of the aisle. And of course pay more for things like endcap displays.
Yeah, that 400 bar decompression would be like being inside an exploding bomb (except exploding in). Instantly turned into a smoothie.